Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fe7e92ac5a5156…

MALICIOUS

PDF

74.3 KB Created: 2021-04-19 11:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 14ce8e5d899dc215ea5a7de56b142706 SHA-1: 74fa5a502098dc9f4c08149e2b562d02b5a6900c SHA-256: 10fe7e92ac5a5156d63d73d922ebf2e4543a0aa5db09e761384717789b6113ae
186 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. 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 0.9999

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://botokaw.ru/strik?utm_term=adding+fractions+with+like+denominators+and+whole+numbers+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424024/normal_6056f5527b16c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410714/normal_5fe648135455a.pdfIn PDF document text
    • http://ttop-shop.com/witejovatig8dsx2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392864/normal_60114b8b6633c.pdfIn PDF document text
    • http://lg-copyrightforms.com/luvomagunapukavuxi8eu73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365628/normal_5fc5960ab0888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_602d0483c3ba7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_f6683aec24f04e7085bf7e452e3142a3.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_0cfe614e8f09406c9ab4937d6ce23253.pdf?index=trueIn PDF document text
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_2ff417fe25ad44dab9b9bec827ab2770.pdf?index=trueIn PDF document text
    • http://gesozep.rf.gd/adblock_for_chrome_free.pdfIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_1f5d46e41f6a47449daa1c1f742e65a9.pdf?index=trueIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_039dfd6e614c4777b8fea1331de24147.pdf?index=trueIn PDF document text
    • http://wupebixa.epizy.com/abecedario_infantil_para_imprimir.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_e5bac880ecd54ff4bf9a566b6fd5251f.pdf?index=trueIn PDF document text
    • http://vonezilomobupir.rf.gd/kivawo.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_off0000e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 5720 bytes
SHA-256: 011fe25a692665b725f816731cb88a1c524801580e3e8488e35127add9983d80
font_01_sfnt_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 11004 bytes
SHA-256: 9b7c01c14b5639e79c81b6b15c07016a12417adbbb02a58c226335b2a49008aa

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