Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7773e3f5307a76…

MALICIOUS

PDF

76.8 KB Created: 2021-03-28 04:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3e92921e835be3e1c4877bee4c1cc72f SHA-1: 0697136c65822a658392dee239b3da183de1227f SHA-256: 2c7773e3f5307a763501fdd34a55b75cd85d7b3417620611d34c502f5dd7776f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to potentially malicious or unknown domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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=ultimate+spider+man+games+unblocked PDF link annotation
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/2961591.pdfIn PDF document text
    • https://tarezusubem.weebly.com/uploads/1/3/5/3/135386237/ginuwo_petujanuxade_pipewomosozo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450145/normal_5fed31219427c.pdfIn PDF document text
    • http://reduslim-shop.website/smok_nord_instruction_manualy7n2m.pdfIn PDF document text
    • http://remont-pc.website/air_force_storekeeper_question_paper5rc6q.pdfIn PDF document text
    • http://ek-arenda.ru/gevalexuvefusuduwiuji.pdfIn PDF document text
    • https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/152894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383138/normal_6030e31335f18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_b106058aa5384eff907eed296987ee36.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satulibaren/1002633732.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/jenasikezirevoz.pdfIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_3fca817625e0456ab4c4f0c2df88e65a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nawuvud/persons_situations_and_virtue_ethics.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/zewemelu.pdfIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_922602527ca842e1b76a6bd045d285cb.pdf?index=trueIn PDF document text
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_fb90e3e21c384ed0b894b91142670afd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f71cea2-f624-4be6-86ba-558b18783bf4/2006_chevy_equinox_3.4_engine_removal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3715e9a9-690a-4d33-90fb-90c48d360143/xawemuruzerurojon.pdfIn 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_off0000e7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 5588 bytes
SHA-256: 1b7e57835beab247f1db2eed54e6db599f12f29793580c55ea5fe6f65e9aa2a3
font_01_sfnt_off0000fae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 12280 bytes
SHA-256: 72c3dcf52eadf42af570b49f431268d75635a263e8a140536fd08ca5008b5408

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