Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8f0e7bdb23aa16…

MALICIOUS

PDF

79.7 KB Created: 2021-05-22 10:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f991d30cee93a7fecbe2e87aa5f65962 SHA-1: 2c08c002ff3de84d9efd855a5609e921c8744b9a SHA-256: 7c8f0e7bdb23aa16329823bfbfea69876153bf6f2cafe37c74b6fe2b5c7767dc
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting, and one primary URL that appears to be a redirector. The document body is heavily obfuscated and unreadable, but the presence of multiple external links suggests an attempt to direct users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://xezojetit.ru/strik?utm_term=novela+mexicana+rubi+capitulos+completos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393785/normal_600de9739c7e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413712/normal_5ff5f1c31e8ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376362/normal_6014183a491e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485313/normal_60253f2ab138f.pdfIn PDF document text
    • https://vigodozoxofi.weebly.com/uploads/1/3/4/5/134599787/80d092b492c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410415/normal_60047d5ba533d.pdfIn PDF document text
    • https://rijamukomebojo.weebly.com/uploads/1/3/4/5/134585881/8f3509778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391898/normal_6015d51556f3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530910/normal_6005ee076f7e2.pdfIn PDF document text
    • https://lenukomezol.weebly.com/uploads/1/3/4/3/134311572/nuzuwonirobosevitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_605681f8de866.pdfIn PDF document text
    • https://repowuvosifopel.weebly.com/uploads/1/3/6/0/136050091/gegatagefuw-masewal-likog-vetidobopib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484122/normal_5ff497904859b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416305/normal_603221a0a9d5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422371/normal_5fe0e56b1b96c.pdfIn PDF document text
    • https://waxitajoxozaner.weebly.com/uploads/1/3/4/4/134474673/zumepesinula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473359/normal_6009682d117b3.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/40739da3-b9f5-47ef-bc3c-f3356149dfdf/levewozuxupemav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e855eb-f75e-407a-b901-0dba1ac0ae0a/wheel_of_time_book_13_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cba3fa1f-7fd3-4162-a75f-0f4a955f5923/how_to_hang_a_curtain_rod_on_a_metal_door.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a3949cb-12a8-45b9-8a10-0e87c78af708/53779748543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/638fca7b-bcbf-48ca-8c38-1d86dc309737/77114260326.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_off0000f69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 5316 bytes
SHA-256: f2d530b5e4e9d7829c5165a467218edf3f0e03be8e65663aef321204a95562f3
font_01_sfnt_off000108a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A4 12216 bytes
SHA-256: 2309ef24bf78940803207d8b3d2b8051c971d14a4f7cea80f8c42fdd865fcb1d