Malicious PDF — malware analysis report

Static analysis result for SHA-256 b087c55964f8a3ea…

MALICIOUS

PDF

83.8 KB Created: 2021-03-15 04:32:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 735fa96614901a750c7fbc0e519b45f2 SHA-1: d103a17f15d3035bc117f67d6ef05f5ac21dcddc SHA-256: b087c55964f8a3ea7d3c437423a3b8d4dea6f5a7a08507a26e2d83ffd43235b3
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to be a lure related to movie songs, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/123?utm_term=bandhan+bhojpuri+movie+songs+free
    • https://zatikavetix.weebly.com/uploads/1/3/2/3/132303242/negigenukarazojo.pdf
    • https://kabudinikibe.weebly.com/uploads/1/3/4/7/134716255/2013817.pdf
    • https://jeripakituwimug.weebly.com/uploads/1/3/2/6/132695489/podolonile.pdf
    • https://rilobajivevet.weebly.com/uploads/1/3/1/4/131438099/1630452.pdf
    • https://static.s123-cdn-static.com/uploads/4462066/normal_5fe18bea415e9.pdf
    • https://dovejopizodumu.weebly.com/uploads/1/3/4/8/134883147/9690907.pdf
    • https://dukilukisa.weebly.com/uploads/1/3/1/0/131070258/niribilo-bujotexakane.pdf
    • https://static.s123-cdn-static.com/uploads/4368999/normal_5fd02bb68ba93.pdf
    • https://cdn.sqhk.co/xudogafu/gSiaz9D/79794667446.pdf
    • https://vosilidasum.weebly.com/uploads/1/3/2/7/132740263/af5f8edec3.pdf
    • https://xuleminemixek.weebly.com/uploads/1/3/5/3/135333740/nevowotaluwupese.pdf
    • https://cdn-cms.f-static.net/uploads/4470967/normal_603df8d3e9fba.pdf
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/e288e229.pdf
    • https://static.s123-cdn-static.com/uploads/4407664/normal_60039c5c7a148.pdf
    • https://wazepitufakox.weebly.com/uploads/1/3/4/7/134735855/dejopuniki-xokinu.pdf
    • https://cdn.sqhk.co/wesuwajil/kjegeMI/cold_war_call_of_duty_beta.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_d009a92902d94b36b5c062f98cfc4c1d.pdf?index=true
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_e25a220d4b504e608a33099e52138c54.pdf?index=true
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_3563340d83134fe795cbb658edda024a.pdf?index=true
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_4140f7454d8242f892615c67c3985ed0.pdf?index=true
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_7a763f5227f541e1acdee1d36221c81f.pdf?index=true
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_5a26ef5ed7644cdcb3f004957479d950.pdf?index=true
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_0fbf9b1fb8b34c6c8237a64567befa9f.pdf?index=true
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_19d20973fc644ee6bda5d889027534f1.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_off0001065e.bin
a76a1ca4c1066d0c1cca926321eea9c205ccb0ea257c0178228b36d2b1b41054		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1065E 5748 bytes
font_01_sfnt_off000119cd.bin
0322ed6155f316f8013adcc09a748f8f8a509da1e2baf6b72db225f72c699844		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119CD 11776 bytes

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