Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2cbcec3f1b53853…

MALICIOUS

PDF

99.8 KB Created: 2021-04-20 18:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d272f0434b411a8ef978d7cff1bc83b SHA-1: 83513bb84503d0e8dfd8583822d9930fe661e86e SHA-256: e2cbcec3f1b538537134af364437a031c1f3357dd9355c994183422339c2f822
186 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, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://seumenha.ru/strik?utm_term=medios+de+comunicacion+en+las+organizaciones
    • https://cdn-cms.f-static.net/uploads/4528915/normal_604d5b705ed4f.pdf
    • https://masejufubalabej.weebly.com/uploads/1/3/4/3/134388341/4756322.pdf
    • https://static.s123-cdn-static.com/uploads/4472776/normal_5ff81f77debc4.pdf
    • http://zuregazezoral.mygamesonline.org/business_english_conversation_questions.pdf
    • https://tesegedoveveda.weebly.com/uploads/1/3/4/8/134891870/3869058.pdf
    • http://pekefosijemibi.sportsontheweb.net/the_crucible_character_body_map.pdf
    • https://jukudedavat.weebly.com/uploads/1/3/0/9/130969580/4188951.pdf
    • https://cdn-cms.f-static.net/uploads/4403414/normal_60340ae3da3d9.pdf
    • https://jawuwokobot.weebly.com/uploads/1/3/1/3/131381435/tukojej-janaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_e804bd9adc7b44a7b9e6529e9ad9faed.pdf?index=true
    • http://momejulalaguja.epizy.com/public_speaking_ebook.pdf
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_6164c63b7a734ae89d14a438bcdc0feb.pdf?index=true
    • https://s3.amazonaws.com/tonisefoteka/how_to_change_a_harbor_breeze_fan_light_bulb.pdf
    • http://vuwepowav.epizy.com/34923178709.pdf
    • https://s3.amazonaws.com/mamukawaxatali/where_does_steam_workshop_mods.pdf
    • http://rejazimuperolik.rf.gd/rangrasiya_serial_song_mr_jatt.pdf
    • http://patesosiw.epizy.com/81614260840.pdf
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_e5608132a03c4d23943793366c060145.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014732.bin
0818232c40c38bc3dd892f7a512336980c268a05998e62922fd5ede2caf9b301		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14732 5312 bytes
font_01_sfnt_off00015936.bin
a8945921d530def149300e605df45c0567fd8fe1fb4a5d70eb343a8afdfe0792		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15936 11936 bytes

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