Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4f8a5526b7fe33…

MALICIOUS

PDF

75.1 KB Created: 2021-04-04 13:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: def8206512ef89fcf9add2803cb299da SHA-1: 2412a682f3da100f54d32997a4bf0be7ef1a104a SHA-256: 8e4f8a5526b7fe33b10c08a6e5b2ffe9b82e6172d6e5694766bf69aa0ebd91c2
176 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or phishing attempt. The heuristic 'SE_CALLBACK_LURE' indicates the document may also attempt to trick users into calling a fraudulent support number. The presence of embedded URLs and the ML classifier's high confidence score support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=forever+21+promo+code+2020+may
    • https://fitetusoxesar.weebly.com/uploads/1/3/1/4/131406062/zasus.pdf
    • https://cdn-cms.f-static.net/uploads/4446286/normal_60492fe72666e.pdf
    • http://goossyy.online/vijalovtif4s.pdf
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/18f6df2.pdf
    • https://gedinabudi.weebly.com/uploads/1/3/0/8/130814056/afb76336.pdf
    • https://cdn-cms.f-static.net/uploads/4417327/normal_601e1714e336f.pdf
    • https://gipulafu.weebly.com/uploads/1/3/4/4/134442702/a889c0b82.pdf
    • https://nisaxiguxizi.weebly.com/uploads/1/3/5/3/135306566/dodurarivisomisujope.pdf
    • https://wakukowasipala.weebly.com/uploads/1/3/4/6/134649118/mavasobid.pdf
    • https://gimatiderimu.weebly.com/uploads/1/3/4/7/134774165/376503.pdf
    • http://gidusalutuwisut.iblogger.org/lawidel.pdf
    • http://myirn.icu/3503022109x64gf.pdf
    • https://leximefowa.weebly.com/uploads/1/3/2/6/132680903/velonozedone.pdf
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5fda6b1f27a53.pdf
    • https://roxupexuwukobeb.weebly.com/uploads/1/3/4/7/134749027/07fb62a9b81f.pdf
    • http://kugamuwefula.iblogger.org/sexual_orientation_meaning_sa_tagalog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://migaxutajudoxu.epizy.com/jowirazorudumejugiguje.pdf
    • http://tunufefenus.rf.gd/bezudiwugagalufisibidiw.pdf
    • http://bolopanezodubun.rf.gd/dodokevojejiveburoseb.pdf
    • http://sidiwen.epizy.com/worth_it_fitness_dance.pdf
    • http://nibewisule.epizy.com/xufefevuveduxoxuva.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3dd.bin
fa50a4ae381f1e582ea40d74fab4df1d00c79c9fe74e7da59464e17a0764dc61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 5452 bytes
font_01_sfnt_off0000f664.bin
a2182969be627fe3717f6839eaa2b82cc554c009f7804a08f2d79b56d7839e35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 11512 bytes

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