Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9f40712e5eb2ff…

MALICIOUS

PDF

82.2 KB Created: 2021-02-12 10:09:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a30a2928c1aaf106858f6edbb9401a6c SHA-1: 42cf01631b6f9e67bb55a669b3b749fc176aa6db SHA-256: af9f40712e5eb2ff17f1406a7b416301328548b2af7fea4f483e43fd37056a6f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially malicious domains, and is flagged by ClamAV as a phishing trojan. The heuristic PDF_SEO_LINK_FARM indicates a large number of outbound links, suggesting an attempt to distribute or redirect users to other malicious content. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=witness+in+death+pdf PDF link annotation
    • https://cdn.sqhk.co/letinumi/gjjghdb/rexville_ny_country_store.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxejelun/ihajnhd/mr_bowling_ball_arborvitae_turning_brown.pdfIn PDF document text
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/35b93cfed.pdfIn PDF document text
    • http://wumofuzusagumo.22web.org/capsule_docs_android.pdfIn PDF document text
    • https://vukedezesul.weebly.com/uploads/1/3/0/7/130776134/a3a588aa03.pdfIn PDF document text
    • https://gikotaduxig.weebly.com/uploads/1/3/1/4/131454052/269907.pdfIn PDF document text
    • http://vijufik.iblogger.org/13138360329.pdfIn PDF document text
    • https://cdn.sqhk.co/tujuvemevo/gfGbDj2/sopanubolama.pdfIn PDF document text
    • https://fukaxoxatu.weebly.com/uploads/1/3/1/4/131438517/6935670.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366969/normal_5ff71a3b30799.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wujodibu/boat_building_plans_free.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/38510285240.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/96509121893.pdfIn PDF document text
    • http://buzuvemujogumob.epizy.com/vanopibafazigozasu.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/7845548338.pdfIn PDF document text
    • http://woxutonugosafer.epizy.com/63303418910.pdfIn PDF document text
    • http://suvowafavij.epizy.com/72888750271.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_off00010758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 5016 bytes
SHA-256: 368f79bc088b22ea8ae28aaa3982032b9584354f2e1e2bd938e1d92e9c80ef40
font_01_sfnt_off0001187d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187D 10376 bytes
SHA-256: f4bc9e00725baa82641b1c9f8952a817af8652bb4e4d1be50b4378386dab87d5

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