Malicious PDF — malware analysis report

Static analysis result for SHA-256 33efedc8f562ae9d…

MALICIOUS

PDF

86.3 KB Created: 2021-03-17 07:29:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d3c699ba6e6ac50d3abffcdf04b6d35f SHA-1: cf5b0cf6dd78750a32cb01f05f9a619d0c095a12 SHA-256: 33efedc8f562ae9d0034e550944a043c6e84f1f2b149438899392626e88d3c57
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute or host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/award?keyword=marksheet+format+pdf+download PDF link annotation
    • http://zanovekolasin.mywebcommunity.org/loxofivajuzuk.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/analog_to_digital_converter_download.pdfIn PDF document text
    • https://pudasebedizut.weebly.com/uploads/1/3/4/5/134587980/nomowa.pdfIn PDF document text
    • http://subuxiwubemew.getenjoyment.net/how_to_crochet_a_blanket_border.pdfIn PDF document text
    • https://vuvuzuvikedatun.weebly.com/uploads/1/3/4/5/134529562/635578.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/texidubip.pdfIn PDF document text
    • https://vomodubezu.weebly.com/uploads/1/3/5/3/135398809/0b0a02c428.pdfIn PDF document text
    • https://zutosexumapa.weebly.com/uploads/1/3/1/6/131606298/nogavofipeti.pdfIn PDF document text
    • https://lopuxewununoj.weebly.com/uploads/1/3/4/7/134748711/a2de94a41a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/41784191-9300-411f-9e4b-45686f022e99/sodastream_fizzi_sparkling_water_maker_bundle_black_with_co2_bpa_free_bottles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cbd64de-de86-4612-a0dd-0d7022141ead/blue_miniature_dachshund_puppies.pdfIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_03b64ddfcd5749b7b53c6e985e40f17f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/que_se_requiere_para_un_buen_maquillaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/117321aa-4db8-4d87-98eb-46c042ddf67f/oops_concepts_in_javascript_javatpoint.pdfIn PDF document text
    • http://jemileti.atwebpages.com/1536856446.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/47130204046.pdfIn PDF document text
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_c8e820302e224425a3abb8e9aa180a46.pdf?index=trueIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_bf87dfbf8ab24c58beb81dfb9c9f3de8.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_696e3a2b661f4fd2b83ef3ac60c52ea3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kotodur/b612_beauty_camera_app.pdfIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_0344241e90fc47089967d957d17f7f10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/72812912097.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/logo_design_studio_templates_free.pdfIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_7a37f1daf14e4633bc3626ee1dc1f5c3.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 2988 bytes
SHA-256: fbe1f4cb8d169c31286959b6896ac665818dc623cda0c2ad134980d8484b8aeb
font_01_sfnt_off0001041b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041B 5184 bytes
SHA-256: ba8d79a79f95b4051f94ca8abb064a8943b21782df2146a13769b03fdd3e70df
font_02_sfnt_off000115a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A9 11900 bytes
SHA-256: a34b2a6b2cbb4825e359fd801c2e3c88ccb3b3c2feca5004e82665869e16d126
font_03_sfnt_off00013cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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