Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f355f299a8e13c4…

MALICIOUS

PDF

76.0 KB Created: 2021-03-07 04:57:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2f2cb4636532e63c69fe3b19cbc2bce1 SHA-1: d9db1d303bde9d0532ae041ad90e97eee3e2c617 SHA-256: 7f355f299a8e13c479ebc657846cde65c05112967caf61dec3a0bcce15b66f28
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear user-facing text. The presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/strik?utm_term=how+to+use+a+rowenta+iron PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384645/normal_603a1f388861f.pdfIn PDF document text
    • https://cdn.sqhk.co/pifizumux/QPjbMih/nuxori.pdfIn PDF document text
    • https://kakenemewaxe.weebly.com/uploads/1/3/4/6/134655752/midagufisufege.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417652/normal_5fe3c3d5783b8.pdfIn PDF document text
    • https://mepagalupotope.weebly.com/uploads/1/3/4/2/134265457/gupaxejujerotiw-mibip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488570/normal_602304b77053f.pdfIn PDF document text
    • https://kazajibabagak.weebly.com/uploads/1/3/4/4/134467412/tiloxi.pdfIn PDF document text
    • https://cdn.sqhk.co/pijovowifil/eiwNunM/xukelilabilogitenidar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447658/normal_601a47ca25dfe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_8633ede9522241f399966cf3a50d8770.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/voice_recorder_app_android_best.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_323c044bd3e049558f52a9cefd9efb2e.pdf?index=trueIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_70b1e29305644149ab89ec33ec30615f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/worksheet_coloring_pages.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/verufuzekuvemejevifazo.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/varufijusirijekojukuje.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_b16f840ff71a48dcbad976408bb487a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/somamere/64831830724.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/sufenezidewagiwalekegejo.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/53430831075.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_off0000ed65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 4700 bytes
SHA-256: fbb212411e62f864510b4ed54a101dd84674810f621ebe14feb54113875d0af5
font_01_sfnt_off0000fd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 11056 bytes
SHA-256: 53f8feccc47fd9db3fe10b69089b177a794f2fe9fb3fea6fe81e640e087c1a67

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