Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c71242d6a1fb930…

MALICIOUS

PDF

78.8 KB Created: 2021-02-28 00:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a5baa5b6678a7eb54056f3b9ad0a40cd SHA-1: 41e6d919b620fd6f5f569f05e3880f01e89f9632 SHA-256: 2c71242d6a1fb930f6b8b4c01f4f3d084e36dcf22d6e124cbb2fb99ad949cc23
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links suggest an attempt to lure users to malicious sites, aligning with spearphishing tactics.

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://dugedepap.ru/strik?utm_term=possessive+adjectives+exercises+for+grade+6 PDF link annotation
    • https://cdn.sqhk.co/tuxonewebuke/ViiACSd/6203624141.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/Ligjhhg/beat_racer_all_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/novitovikor/wgfOGc4/learn_python_programiz_apk_download.pdfIn PDF document text
    • https://givodevivunafa.weebly.com/uploads/1/3/1/8/131871579/fijuzifijeb-wulasato-jetukimezonedif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455669/normal_6006e4a6a3266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474723/normal_5fd3bc17c02fd.pdfIn PDF document text
    • http://differencecheats.net/50440779748r8lke.pdfIn PDF document text
    • https://cdn.sqhk.co/gulijolane/eihjagg/69027135804.pdfIn PDF document text
    • https://memagakotis.weebly.com/uploads/1/3/4/7/134760483/5fb08c338da6273.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/jbwgcvq/58380316688.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/21297302385.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lupugavediroz.rf.gd/vuresukebig.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_off0000f611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF611 5516 bytes
SHA-256: d0b1fde9a5ac355db7c8c0422f82538dc81a3a391e1f2148b0d72701c70574d1
font_01_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 10868 bytes
SHA-256: 73e92911dd301c5069ffc8d4c952ebb7070379df50c98ab3bdef7a2e0d1d8ede

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