Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0db33ce3caac671…

MALICIOUS

PDF

76.6 KB Created: 2021-03-26 06:50:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 40660e8a14718f6f5b07cd311cfd765f SHA-1: e793f72baeaf602b3a9f6e055eaa0015f96ad53f SHA-256: c0db33ce3caac671c86702ff18216294fcc1da287c4d9262a5d6602ee040a7c6
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://seumenha.ru/wix?keyword=san+gabriel+elementary+south+gate+ca PDF link annotation
    • http://wovuwukotuvoxi.mygamesonline.org/34631989102.pdfIn PDF document text
    • https://pasojifet.weebly.com/uploads/1/3/0/7/130776368/tepelofa-rikivejud.pdfIn PDF document text
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/sopisilaj.pdfIn PDF document text
    • https://kobalogowitat.weebly.com/uploads/1/3/0/7/130776452/42c6d559.pdfIn PDF document text
    • https://vomizovuzib.weebly.com/uploads/1/3/1/6/131637161/vinewidukutaziti.pdfIn PDF document text
    • http://gudelew.mywebcommunity.org/nalaxizalifovisijole.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496824/normal_5ffc2dd9474ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491687/normal_60466f6c385ec.pdfIn PDF document text
    • https://lilikegemuvil.weebly.com/uploads/1/3/1/3/131398424/4243503.pdfIn PDF document text
    • https://tilemutafadat.weebly.com/uploads/1/3/1/8/131856023/viroxazupexix-dobutopadi.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/dufiderujikaxide.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/duxifetevadazudazep.pdfIn PDF document text
    • https://kewakovek.weebly.com/uploads/1/3/4/4/134467638/komer.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/understanding_public_policy_thomas_dye.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_5fd85c59b71dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489412/normal_6055b17cb081f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471706/normal_603a17e0199df.pdfIn PDF document text
    • https://lirisosu.weebly.com/uploads/1/3/1/3/131384099/9e506.pdfIn PDF document text
    • https://vatedubajepe.weebly.com/uploads/1/3/4/3/134371970/jemogepiwapirutu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://471876dd-1950-42f1-a4b7-18bccbaeda70.filesusr.com/ugd/5d8976_68d99f99c6a649c5bd887e53ba50221f.pdf?index=trueIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_4526ef9455684ec38fc1214c4470ddae.pdf?index=trueIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_ba535932fa2a4f758ffdbd4c22df431d.pdf?index=trueIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_a69d6ac7aba64e0fb618b95c1af504f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rorives/how_to_change_canon_ink_cartridge.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/lovadanolelulope.pdfIn PDF document text
    • http://sazurufupamaxa.myartsonline.com/basic_english_exercises.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_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 5560 bytes
SHA-256: ad4b714a14373cbde75bfd3890c94d6d3d2aaf5ae19d975579df805cd1a9874e
font_01_sfnt_off0000fdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 11368 bytes
SHA-256: 990d5ab909fe5ae1195d42597c2710815ca92b7d443907bb5568806b520a2154

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