Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef34164e30adaa1…

MALICIOUS

PDF

76.0 KB Created: 2021-03-21 04:11:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7bcc34f637ff8642eb506ee5b1efc08b SHA-1: 67230602d30d1ca30edcfa988dc11f7d64126c78 SHA-256: 0ef34164e30adaa1faa6ca9838b4612e67eb10f0b4e51c9a8cd9c63a1995e9c2
186 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or the use of embedded JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://nipisod.ru/wix?keyword=exponential+and+logarithmic+functions+worksheets+pdf PDF link annotation
    • https://cdn.sqhk.co/letarezetap/qCFbfIF/free_funeral_program_brochure_psd_template.pdfIn PDF document text
    • https://cdn.sqhk.co/duzemata/iegjhi1/hands_cramping_up_while_sleeping.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirurafixi/whjj8Tb/dead_alone_lyrics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471109/normal_5feb8155f05d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417988/normal_6036d1d0f3729.pdfIn PDF document text
    • https://cdn.sqhk.co/mixirulizab/jdidihc/gamedamipevadikumebuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494893/normal_5fdd8e9ede802.pdfIn PDF document text
    • https://cdn.sqhk.co/losegiro/RifqMVY/nfl_teams_playoffs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449788/normal_604a4c5b080f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403128/normal_6030e722e299c.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://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_14419b9f2ba144a3bff8c59f14a3c7ea.pdf?index=trueIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_1e27876ba5644970a68c84e150b3640e.pdf?index=trueIn PDF document text
    • https://ff536187-e25a-4bd2-965b-ff1113cf40b0.filesusr.com/ugd/bfcccc_aaf47401020c45588d782f1220e7f80c.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_e5ac96be4bb545f2a22983b3ce782545.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb816627-9ac7-4018-b1db-b47766d31de1/15954578213.pdfIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_447a5c8a96654e7ca58c49ff186f9d65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/834ec635-af59-4d7c-b81c-625625a31b30/health_information_unreliable_sources_examples.pdfIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_7f6ad7e700374fed810af02e934e7e1c.pdf?index=trueIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_4f9f7d79a76140c490129bffeb3d32a9.pdf?index=trueIn PDF document text
    • https://995be609-08d3-41b1-a6c0-90e53670bcec.filesusr.com/ugd/9988e1_e86aa1e7f88b4a51a1c8c9774c61b9c9.pdf?index=trueIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_40882ae3ed074447955b3d5187ce27eb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6C 5632 bytes
SHA-256: 433b3f10e3b038f70daf1879643be63e3abce778215f41ee6f5ff8c18800c34f
font_01_sfnt_off0000f07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07B 10472 bytes
SHA-256: c814ef17cb76b0f170dbe09f2e59a91e1bf0dbf46091e606b0cf82d9bdfd80fb
font_02_sfnt_off00011447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11447 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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