Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40daee120cc8ed4…

MALICIOUS

PDF

78.9 KB Created: 2021-03-16 07:24:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c0cd767ca4f56bd8a59283250111cad4 SHA-1: 6ac090c6a88c73b20f9a12266afc41ff96097ea0 SHA-256: c40daee120cc8ed45d6440d2946a10a0c994bd3a929db9db7327ce451a5ffe2b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of a 'download button' lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to trick users into downloading or accessing harmful content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wix?keyword=wifikill+apk+pro+download+2.3.2 PDF link annotation
    • https://lowutifita.weebly.com/uploads/1/3/4/3/134352456/duvuxe.pdfIn PDF document text
    • https://wimitefadekox.weebly.com/uploads/1/3/4/5/134586198/5830105.pdfIn PDF document text
    • https://punoburewi.weebly.com/uploads/1/3/4/3/134305970/vezazibaze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488329/normal_6045e921c65e5.pdfIn PDF document text
    • https://fibusoza.weebly.com/uploads/1/3/0/7/130775704/6274115.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373769/normal_5fc70d3fd18aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406223/normal_5fd628d05e75f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392862/normal_601b7b45f248b.pdfIn PDF document text
    • https://muxiduxipa.weebly.com/uploads/1/3/5/3/135319221/3252824.pdfIn PDF document text
    • https://xetutimi.weebly.com/uploads/1/3/0/9/130968997/2358248.pdfIn PDF document text
    • https://bizunasudene.weebly.com/uploads/1/3/5/3/135345394/5d2f305460fe14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_60260b487ddff.pdfIn PDF document text
    • https://weneboremuneje.weebly.com/uploads/1/3/5/3/135317625/pexos_xedonejegusud_davukasap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5395c726-f8e5-4267-96da-f17b8d8765f1/what_are_the_key_components_of_a_good_news_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9a0b10f-65c0-4987-94a2-f80f8800b4d8/12418427064.pdfIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_168118c5579f46928b96bb3b135b8b14.pdf?index=trueIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_d45c1403c7854b5db13117806ea45ce0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/466fcbc5-e3e0-47f1-9ef3-248d198225b3/what_is_normalization_explain_1nf_2nf_3nf_bcnf_with_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/440d12b7-3ae9-4418-bf44-5c9a41e1f632/yard_machines_21_lawn_mower_190cc_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf771a1d-7961-4607-9ff5-f4437bd703f2/dasunopowuxadid.pdfIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_999cebb2dabb459498bc25248a13b2f9.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 5352 bytes
SHA-256: 35f9bbac6e7085df1aa6d1fe79d548ba7c8a3cec562ba6ee23b82abfd3aff38f
font_01_sfnt_off00010609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 12872 bytes
SHA-256: 477b28b1b564cfe8895116fdc44e531cc1b4af656a1df974ee7809346725c76b

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