Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b79c56a55b95901…

MALICIOUS

PDF

74.7 KB Created: 2021-05-24 08:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5401f32bbb16bb277300c77043209af1 SHA-1: eb00d83c4bc1755cf654a4abde3a207eee9995d0 SHA-256: 3b79c56a55b95901e5453ed46bd871640ee278aa86457ad25ce8f92b7a20283a
156 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 phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. The document body, though partially obfuscated, presents a lure related to postage meter stamps, which is likely a pretext to drive users to the embedded URLs for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=how+to+read+a+postage+meter+stamp PDF link annotation
    • https://dimafivatoputir.weebly.com/uploads/1/3/4/4/134496040/ginovedarol-fewolutim-wofipejiwafamom-jivexewol.pdfIn PDF document text
    • https://metulomoponi.weebly.com/uploads/1/3/4/4/134498565/relekodu.pdfIn PDF document text
    • https://doxipawuno.weebly.com/uploads/1/3/2/6/132682924/326aff.pdfIn PDF document text
    • https://metulomoponi.weebly.com/uploads/1/3/4/4/134498565/dd87bb67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483851/normal_5fcd366a8b57f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470964/normal_6057c801bd445.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417040/normal_5fe1a4549f654.pdfIn PDF document text
    • https://jexujomasok.weebly.com/uploads/1/3/5/3/135343442/3761826.pdfIn PDF document text
    • https://pegepujime.weebly.com/uploads/1/3/1/4/131453637/zijofowimugoxo.pdfIn PDF document text
    • https://vemekejafor.weebly.com/uploads/1/3/4/0/134012611/5179052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_6026eae44b40d.pdfIn PDF document text
    • https://maloxozalujov.weebly.com/uploads/1/3/4/6/134624338/nelesilekobizi_puvepagad_rofat.pdfIn PDF document text
    • https://vojutodebol.weebly.com/uploads/1/3/4/0/134096580/mosofano.pdfIn PDF document text
    • https://dunofedipusafo.weebly.com/uploads/1/3/4/4/134477286/e4ab7feb84c5.pdfIn PDF document text
    • https://luzidasagozoro.weebly.com/uploads/1/3/4/3/134319964/zaxun-kobopoju-diguw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/sharepoint_designer_2013_tutorial_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/vedasevaxata.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/butulapapibuvasopetug.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/beach_fishing_reels_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/what_does_a_client_service_coordinator_do.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_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 5300 bytes
SHA-256: 98b0c85c017afd98e5fb8aa7098f926f4ef8072556b3f954ec519cd812759f6d
font_01_sfnt_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 10256 bytes
SHA-256: 3419cd73274d4f1e319a721c963706bf7df9b5e6b87acf195a6fd5652133c6c2

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