Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fbf923b4a576643…

MALICIOUS

PDF

77.2 KB Created: 2021-05-31 10:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 92aa09b9fbee639af4cbb3ebb61a1af6 SHA-1: ac469eb3e2e171d4131a2ba92982b14ba28c8753 SHA-256: 9fbf923b4a576643de78c3dce1e2b8bedb6a86bb73b6b077935039f56a37f952
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing or trojan activity. While no scripts were extracted, the embedded URLs and the heuristic findings of a link farm and potential phishing lure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=how+to+add+fnis+as+a+tool+in+vortex PDF link annotation
    • https://fulojexerewo.weebly.com/uploads/1/3/5/3/135345176/weguduxutejabux.pdfIn PDF document text
    • https://dowawanezezezo.weebly.com/uploads/1/3/1/0/131070762/9927161.pdfIn PDF document text
    • https://lemosipezo.weebly.com/uploads/1/3/5/3/135326275/gafevuxovakegu.pdfIn PDF document text
    • https://wizenifove.weebly.com/uploads/1/3/4/3/134308138/725e30f8baeab1.pdfIn PDF document text
    • https://jofogeva.weebly.com/uploads/1/3/4/5/134505403/8ce9127a48e.pdfIn PDF document text
    • https://poxuweke.weebly.com/uploads/1/3/1/6/131606533/6454874.pdfIn PDF document text
    • https://xokufilamiv.weebly.com/uploads/1/3/1/4/131437438/c557c.pdfIn PDF document text
    • https://xedazebo.weebly.com/uploads/1/3/4/4/134497739/12a407756da900.pdfIn PDF document text
    • https://sararilaba.weebly.com/uploads/1/3/1/4/131482808/e3a26aa.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/zijopokewat_nitap_vewakugifibegow.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/665cc8d9-c0ca-430c-a58f-567e766f7519/84700132480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f818b6-0c6f-4c9e-b3c3-c6c685f7557b/how_to_clean_washing_machine_drum_samsung.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dff502b8-48fd-4b5e-82bf-762bd7acc516/weber_smokey_mountain_mods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/768d0cc2-3eb8-428d-b38b-fbbfd9b840d7/d-link_model_dir-615_reset_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1d74742-943d-443e-9973-2d397db6bb2b/how_to_use_incentive_spirometer_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2555543-0f82-4b30-8ddd-33b8f8d609d4/why_does_my_water_heater_keep_tripping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4060905e-6652-49c7-af34-4a8d32ffe197/understanding_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d349d74-55b5-4170-b3ef-0bc5bd459e97/nexinufep.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_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 5080 bytes
SHA-256: c9c871e737fec7ea4bb019a81616401e1ca49801ac9ed4aee28afc3d321b71ec
font_01_sfnt_off00010186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10186 11180 bytes
SHA-256: e04a1925e46849cca5f3a30430588428b0d297b92ea32f9cd089a62671969f62