Malicious PDF — malware analysis report

Static analysis result for SHA-256 3722d06b3fb30095…

MALICIOUS

PDF

67.1 KB Created: 2021-03-28 18:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c541b0b2b6b2d04e8e93569cb14248ea SHA-1: 0df2ab7c6ca2f32e06c2ea096d96732db9d04707 SHA-256: 3722d06b3fb300954f537cb5a1c14cae7e7e3f1e6d1ccffd344cf8f0f4494ffd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to drive traffic to potentially malicious sites. The document body, though heavily obfuscated, appears to be a lure related to accounting answers, likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/wix?keyword=chapter+15+aplia+accounting+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455399/normal_5fed20c7a510d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374207/normal_604c9f4f539f0.pdfIn PDF document text
    • https://tekerigaxigo.weebly.com/uploads/1/3/4/7/134702693/512e8dc51a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458827/normal_6012fc0ac375c.pdfIn PDF document text
    • https://wijedokimevu.weebly.com/uploads/1/3/4/6/134649091/4905023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416802/normal_604d6310c1688.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/77502607227.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443598/normal_60084a1c4e875.pdfIn PDF document text
    • http://gavojutopubiri.getenjoyment.net/70712065723.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453741/normal_5feb40df9b2ba.pdfIn PDF document text
    • http://vazagitomis.mypressonline.com/bose_quietcomfort_35_series_ii.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_4a624348c5844b8299f5aa1024474efe.pdf?index=trueIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_b198f8776b774547875340807de24bda.pdf?index=trueIn PDF document text
    • http://gagolabirej.atwebpages.com/80529026709.pdfIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_e813b2762a5444669ef0ea6907614a18.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_cb3857f8fd104d50b7fadef01a2efadd.pdf?index=trueIn PDF document text
    • https://9c50f6df-e9c1-453e-a208-eff1cefe231f.filesusr.com/ugd/44b3dc_56b22f45499d4e13bcd4f003efe014c2.pdf?index=trueIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_4c2913de992641e3846e5e82a6affdcb.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_off0000c8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C2 5368 bytes
SHA-256: 2c14b4e76dfc62099c0e458f345fa02687079acdf229c48e27fc0adf2017f30a
font_01_sfnt_off0000db11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 10620 bytes
SHA-256: 435ecc7c40b926c29004c70ac0da51312f9eed27b1de678b47eaa5035fc0cbf4

Open this report in the interactive analyzer, or submit your own file for analysis.