Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd203708bd1158d1…

MALICIOUS

PDF

70.8 KB Created: 2021-02-24 11:38:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 250944c82dc37e794c9e499d0ab5dc6e SHA-1: 489f404f8d92ac19b91a8b3fc2ccf59d62016116 SHA-256: cd203708bd1158d193c1a470336df5ee3c48e3cde6f52663f91d62d41a54479e
312 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or redirectors, suggesting a link farm designed to distribute malicious content or phish users. The document body, though heavily obfuscated, contains keywords related to customer service and urgency, aligning with phishing lures. The presence of PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics strongly suggests the primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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.
  • 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
  • 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://crophysi.ru/aws?utm_term=sentry+safe+customer+service+hours In PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/lokopunepijupefu.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/jZHYRje/notatone.pdfIn PDF document text
    • https://cdn.sqhk.co/sanojuxako/hOridmB/wavitanisijinerurodetitab.pdfIn PDF document text
    • https://vawenajibafadak.weebly.com/uploads/1/3/1/3/131384306/peromenovafomome.pdfIn PDF document text
    • https://cdn.sqhk.co/saturarad/ebZ0Xhj/viking_vmod5240ss_trim_kit.pdfIn PDF document text
    • http://dukovasupufe.iblogger.org/gangster_movie_all_songs_2016.pdfIn PDF document text
    • http://wuwisometojone.66ghz.com/53867719682.pdfIn PDF document text
    • http://galoomer.online/ninja_assassin_warrior_legendary_super_hero_surprise69dti.pdfIn PDF document text
    • http://formblckr1.xyz/344492372077ncvz.pdfIn PDF document text
    • http://vixerixobo.22web.org/65980547694.pdfIn PDF document text
    • http://in-arenas.com/rofazogedusabawiebcqa.pdfIn PDF document text
    • http://unosital.space/42240165903mrtgd.pdfIn PDF document text
    • https://mafugefowodofo.weebly.com/uploads/1/3/1/3/131378796/nulonoleramufu.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/hfYZxfa/rewixawizaro.pdfIn PDF document text
    • https://cdn.sqhk.co/miwavilusaji/cNkv1TS/bottled_mod_apk.pdfIn PDF document text
    • https://munerotilaxamo.weebly.com/uploads/1/3/4/4/134476206/rajukemosimuso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kebanibaru.epizy.com/my_breakup_diary_images.pdfIn PDF document text
    • http://litopuputorer.rf.gd/kemojinu.pdfIn PDF document text
    • http://mafixatoje.epizy.com/ethiopian_newspaper_reporter_english.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_off0000d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 5352 bytes
SHA-256: e9eab8ec41e906165ad2d608cd6d136d44c5cfed68194ab19f7af3035fde4db6
font_01_sfnt_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 10608 bytes
SHA-256: 37fb32c513a57f8a3377d24cc9c5edb78e255faed60ccf01b3551e305edab7ed