Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa7404fb8774a96…

MALICIOUS

PDF

73.4 KB Created: 2021-06-11 22:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b852de7e05546d2c4dd134967d82ced SHA-1: 08eebdc1b82000aecedc03feb66994b9d0fd3c6c SHA-256: 2fa7404fb8774a96166dc8b05b71960b4b657ddd3388468ce8c0dff1096adedc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a phishing or spamming operation. The document body, though heavily obfuscated, contains text related to a syllabus and the wkhtmltopdf application, indicating it's a lure. The presence of multiple unknown URLs and ClamAV detection further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • 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://midufefew.ru/123?utm_term=bams+2nd+year+syllabus+2018+pdf
    • https://kesozelakix.weebly.com/uploads/1/3/5/3/135300748/8155850.pdf
    • https://cdn-cms.f-static.net/uploads/4488837/normal_604914b41d6cd.pdf
    • https://static.s123-cdn-static.com/uploads/4494674/normal_5feeee8dd870d.pdf
    • https://cdn-cms.f-static.net/uploads/4368741/normal_603238ba47c60.pdf
    • https://cdn-cms.f-static.net/uploads/4466662/normal_5fd3ce846169e.pdf
    • https://cdn-cms.f-static.net/uploads/4370791/normal_60494178b5cec.pdf
    • https://gipusarele.weebly.com/uploads/1/3/4/7/134708700/85b33be8.pdf
    • https://cdn-cms.f-static.net/uploads/4476567/normal_60322253a8cdd.pdf
    • https://judewefa.weebly.com/uploads/1/3/4/6/134652715/4fdba4d340b1f29.pdf
    • https://cdn-cms.f-static.net/uploads/4410006/normal_5fd14150796a0.pdf
    • https://cdn-cms.f-static.net/uploads/4383571/normal_605d7c6143119.pdf
    • https://lotetirupaxep.weebly.com/uploads/1/3/4/0/134013035/6434864.pdf
    • https://static.s123-cdn-static.com/uploads/4481985/normal_6002028cf37a4.pdf
    • https://zuxibonidape.weebly.com/uploads/1/3/4/8/134889984/nuxesuzasebuv-jigugipo-kexoris.pdf
    • https://static.s123-cdn-static.com/uploads/4448339/normal_5fc5e59587c10.pdf
    • https://cdn-cms.f-static.net/uploads/4402519/normal_60331f5648200.pdf
    • https://cdn-cms.f-static.net/uploads/4409425/normal_6049bbee5a41b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kemususi.pbworks.com/f/joe_bonamassa_driving_towards_the_daylight_lyrics.pdf
    • http://jebusolole.pbworks.com/w/file/fetch/144641532/87644168777.pdf
    • http://mulasamesi.pbworks.com/w/file/fetch/144575424/how_to_download_td_bank_statement_online.pdf
    • http://bajaduxaxusi.pbworks.com/w/file/fetch/145019331/modern_powerpoint_themes.pdf
    • http://namikikis.pbworks.com/f/13392349865.pdf
    • http://tavaretaz.pbworks.com/f/planeaciones_de_tercer_grado_preescolar.pdf
    • http://denipugo.pbworks.com/w/file/fetch/144617562/73017541749.pdf
    • 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_off0000dd92.bin
ef853cd26aefde532252e55839df7aff1d5a8f1a3fbb97851126088523b76b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 6000 bytes
font_01_sfnt_off0000f1ef.bin
140d166d513e746cd742d472f136cd2ddd683f867088694bf56a77c45d1643f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 11432 bytes

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