Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bdb6f7ed915c4b…

MALICIOUS

PDF

79.2 KB Created: 2021-04-08 08:39:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 224adf729979a8b475a5a6193f982099 SHA-1: f1340a3f7212681b13a471433b700cb630adc22d SHA-256: 57bdb6f7ed915c4bc30de82411ec8104e51f5e655783f1ff57c75a929c47f3fd
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=blm+bull+and+rodeo+gordonsville+va PDF link annotation
    • http://xijulefabogi.getenjoyment.net/biblical_timeline_chart.pdfIn PDF document text
    • https://zotabuja.weebly.com/uploads/1/3/4/5/134510490/7698469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_60420a4d71f02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443608/normal_60176b9d6b2e0.pdfIn PDF document text
    • https://xunujilitaga.weebly.com/uploads/1/3/5/3/135315779/nonaredewexep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426280/normal_5fc97b07d5dd9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_33e9a68dfdb24d409a4ad69a8558b623.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pujirageg/2550584131.pdfIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_ee3d642f1d764159981dc8b5a92fbde1.pdf?index=trueIn PDF document text
    • https://f0ded7c6-1882-44c2-b580-3fd8daacf182.filesusr.com/ugd/1cd4ca_daf21f0f15b543b98c1e4cf62dfb731b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zopenave/toxove.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/kafakuzowa.pdfIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_37367e2ca9f04cf19c042e7441b65cad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukusa/husky_450_chainsaw_parts.pdfIn PDF document text
    • http://xufolat.atwebpages.com/diccionario_bblico_nelson.pdfIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_62f2d9517cd3490c80d8cc69e6bb1ef9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/eboardresult_marksheet_2019.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 5392 bytes
SHA-256: 4613078b910ef362fac079e2218bb651ffdf9b37bb9391168df1c812a2546478
font_01_sfnt_off000107d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 11556 bytes
SHA-256: bd248e7a30ab1bf4eefaf18eafbe44e97cddc0c3b1e37a8a3c55c16e5e8ade50

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