Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8a34d1bc2e7fe5…

MALICIOUS

PDF

79.9 KB Created: 2021-05-29 13:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b86063de294fa8f6e4824a99f18a8fef SHA-1: 750c9f93a71d79f302175910ab16c2a04f7c88bc SHA-256: 5b8a34d1bc2e7fe5d203f1c95c11eebbed069ba0e8c429a7390ffebdd842b0f6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based 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 0.9997

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://baarspo.ru/strik?utm_term=what+is+72+divisible+by+7 PDF link annotation
    • https://xapewagese.weebly.com/uploads/1/3/4/3/134314981/naxaposidege-pixunawedul.pdfIn PDF document text
    • https://wozexofinudere.weebly.com/uploads/1/3/5/9/135984457/5594850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_5fd994bc2ac0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_601dca2a31812.pdfIn PDF document text
    • https://nesexabaxurozij.weebly.com/uploads/1/3/4/8/134898102/mimogabibomoj_guvuninim_widilujopuzu_nugiz.pdfIn PDF document text
    • https://nebavorod.weebly.com/uploads/1/3/1/4/131406600/6ee667.pdfIn PDF document text
    • https://pivikupawo.weebly.com/uploads/1/3/4/3/134356995/b3e217be20a1ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455642/normal_606087054bfd1.pdfIn PDF document text
    • https://kamurodogoruvax.weebly.com/uploads/1/3/4/8/134887894/tonobidege_nisisab_punedizubiw_busaz.pdfIn PDF document text
    • https://voxuvuru.weebly.com/uploads/1/3/5/3/135390020/b1939ddf2c1b7e7.pdfIn PDF document text
    • https://zozabamefopofa.weebly.com/uploads/1/3/4/2/134234868/vaveboxikulimetujir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485576/normal_6060068ae0289.pdfIn PDF document text
    • https://korubati.weebly.com/uploads/1/3/7/5/137515423/6a2da429.pdfIn PDF document text
    • https://razebefalokugex.weebly.com/uploads/1/3/4/8/134895215/runod.pdfIn PDF document text
    • https://devusabuzanuwuz.weebly.com/uploads/1/3/4/3/134352374/2009662.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b271537-c37a-42c5-afc2-c0190a8c72db/how_to_make_logo_for_hair_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcfeb2df-5232-4f54-8af6-855e82ddbd80/which_is_the_best_55_inch_4k_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d62206e-7e3b-46bd-86e1-f60bcb4f852b/39110547820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b6c1b33-77fc-4177-9604-cfdf68ce74e8/donufewufuvugovepujimuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e24bf2e9-25e1-468b-8cdf-b2caa3222972/5750542592.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 5344 bytes
SHA-256: d26b5e5271f05babd6fd3b9d84ed78f29418af9488385f536911c212a2b6c95b
font_01_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 11192 bytes
SHA-256: 3c0aa391dba042fcd0da396e3e51c82259a385ec2b387ff494580214ca2379aa
font_02_sfnt_off00011af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF2 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e