Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cea7201d4ea154…

MALICIOUS

PDF

73.6 KB Created: 2021-03-24 14:54:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9d32e2a334e6a437cc8b8a0f76d5bb70 SHA-1: a12d1fc4def5e11b8c1e3e3996dba68ed43c0508 SHA-256: b7cea7201d4ea154ccdfec444c7330e6307e17ac18903a72757b786e43adf249
234 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of an invisible link to a suspicious domain further supports this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://bologen.ru/strik?utm_term=gold%2527s+gym+treadmill+maintenance PDF link annotation
    • https://kurakozizuvev.weebly.com/uploads/1/3/2/6/132681999/7e1d4.pdfIn PDF document text
    • http://matcobzor.ru/ragataxaxuvagm5xww.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvaworizon/gejiiaD/20513262440.pdfIn PDF document text
    • https://radogatibemif.weebly.com/uploads/1/3/2/8/132815767/xasilifenoranovuf.pdfIn PDF document text
    • https://defiduzumuxel.weebly.com/uploads/1/3/2/6/132682342/miwiledanuna.pdfIn PDF document text
    • http://nonowun.mywebcommunity.org/vertigo_treatment_guidelines.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/12068153392.pdfIn PDF document text
    • https://kowepesabileb.weebly.com/uploads/1/3/4/6/134635017/wozad.pdfIn PDF document text
    • https://pipamoximiketo.weebly.com/uploads/1/3/0/9/130969724/7940538.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/motorola_surfboard_extreme_sbg6580_firmware_update.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/xuvufurumesefaxotaj.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/SXbTLhi/zomixegebepani.pdfIn PDF document text
    • http://ferafukapawap.scienceontheweb.net/yamaha_natural_sound_av_receiver_rx-v373_wont_turn_on.pdfIn PDF document text
    • http://loginwithfb.site/blender_for_dummieszjlo0.pdfIn PDF document text
    • http://antonioita.fun/51377577438tzaca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kotasogova.rf.gd/jekixamepevizofari.pdfIn PDF document text
    • http://gixejemazob.myartsonline.com/35397656264.pdfIn PDF document text
    • http://kesexawes.rf.gd/how_i_dress_quotes.pdfIn PDF document text
    • http://sutekotuluzuwed.rf.gd/dnd_5e_best_classes_for_each_race.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_off0000dfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA8 5428 bytes
SHA-256: 300701736144bde5eab6bff6f1fb806692ca111581e6672bc5f20364cebbccf7
font_01_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 11060 bytes
SHA-256: 34bd6e2d353e4298d8cb7233fb2983c4f3558993612780445211760cba10c870