Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d2e6376078cf79…

MALICIOUS

PDF

76.9 KB Created: 2021-03-02 20:25:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9bad3eceb3605aee141b8cec0bfcd337 SHA-1: b0af43af99b22069bc35337fc6775074a721095b SHA-256: 49d2e6376078cf79e3020149e994eafa7366da3d0a19691bad3034d4a65c2303
186 Risk Score

Malware Insights

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

This PDF file was flagged 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 used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to cleaning tips, which is a common tactic to disguise malicious content. No scripts were extracted, but the numerous embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/123?utm_term=how+to+clean+my+general+electric+stove PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403817/normal_5fecb1198a8b7.pdfIn PDF document text
    • https://cdn.sqhk.co/jobubexivex/jejbaif/nuzovikiparuvezizaz.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/jcieQDR/contacts_lenses_halloween.pdfIn PDF document text
    • https://barijimuje.weebly.com/uploads/1/3/1/4/131406344/gijigof.pdfIn PDF document text
    • https://wetolobumusu.weebly.com/uploads/1/3/4/5/134579125/zuzijut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487935/normal_5fedbc568f42b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487191/normal_600005199e2df.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/xE2idGM/konigubewofadid.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/awcihrM/93008504492.pdfIn PDF document text
    • https://tolorojefa.weebly.com/uploads/1/3/2/6/132681575/bezedonevoborid.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/KROyJha/sisogokuwejazogag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391314/normal_5ff1999973d21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469370/normal_60051fd378841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_60160e96b63bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412774/normal_5fd673209b61c.pdfIn PDF document text
    • https://lexobazotukagof.weebly.com/uploads/1/3/1/4/131407042/9bbe6219d5f60d.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/7577959.pdfIn PDF document text
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/8029704.pdfIn PDF document text
    • https://lejegibovijidup.weebly.com/uploads/1/3/1/4/131438293/muduvoduf-nofusezabatur-dobilutaxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ef16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF16 5336 bytes
SHA-256: 490424dae54f75b3a7c18abda286c807d275129e4c60503886740a559fdf2647
font_01_sfnt_off00010145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 10808 bytes
SHA-256: 4005ce0ffa5edd7e07acfd422881bba0182f348521c7cd3cded1675ae086de79

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