Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb15f14a591b4c1b…

MALICIOUS

PDF

77.6 KB Created: 2021-03-23 19:39:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca61f5c395ddb441321e5562b1af3130 SHA-1: 677b7b4760873f3956e98c5092515398ed2f1e9d SHA-256: bb15f14a591b4c1bd131c1051c5925053bb5689070cf133356c558c361b55b58
204 Risk Score

Malware Insights

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

The PDF contains lures for advance-fee scams and fake invoices, aiming to trick the user into downloading further malicious content. It includes a large number of external links, many pointing to PDF files, suggesting a link farm or a method to distribute further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://lozipotod.ru/123?utm_term=free+tax+invoice+templates+australia
    • https://cdn-cms.f-static.net/uploads/4451355/normal_603b7229950a5.pdf
    • https://pitazifuriza.weebly.com/uploads/1/3/0/9/130969431/9925775.pdf
    • https://zoparidozuxeb.weebly.com/uploads/1/3/5/3/135390671/duxirokomuw.pdf
    • https://cdn-cms.f-static.net/uploads/4460677/normal_605070cf331ea.pdf
    • http://zunololanuxigu.sportsontheweb.net/wukovarigow.pdf
    • https://cdn-cms.f-static.net/uploads/4369917/normal_5fe7e5c1f40fa.pdf
    • https://static.s123-cdn-static.com/uploads/4443803/normal_5fdfd03dab949.pdf
    • https://vesumuzuvof.weebly.com/uploads/1/3/4/6/134685641/donozatikeniw_fabedotepikaka_safuzenuvoj.pdf
    • https://budojidotepaso.weebly.com/uploads/1/3/5/3/135312143/6680935.pdf
    • https://xukokamil.weebly.com/uploads/1/3/4/3/134317204/fesamadedawifitefare.pdf
    • https://static.s123-cdn-static.com/uploads/4447101/normal_5ff5d06f36986.pdf
    • http://ladekepevij.mygamesonline.org/4405263337.pdf
    • https://static.s123-cdn-static.com/uploads/4417983/normal_5ffdc2ff721ab.pdf
    • https://static.s123-cdn-static.com/uploads/4377371/normal_5ff0eb66680d8.pdf
    • https://cdn-cms.f-static.net/uploads/4417305/normal_601fdd3c06694.pdf
    • https://xoxatujetila.weebly.com/uploads/1/3/0/7/130775098/1883846.pdf
    • https://static.s123-cdn-static.com/uploads/4471514/normal_5feecb0e046ab.pdf
    • https://cdn-cms.f-static.net/uploads/4393197/normal_6031d0521a26f.pdf
    • https://cdn-cms.f-static.net/uploads/4393515/normal_5fd894a1f2120.pdf
    • https://static.s123-cdn-static.com/uploads/4366008/normal_5ff18312521e7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://josuxak.atwebpages.com/dimasuwineselodulazuwado.pdf
    • http://sawurawefivovo.myartsonline.com/denuz.pdf
    • http://josesomesube.myartsonline.com/basic_java_interview_questions_and_answers_free_download.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_off0000f049.bin
2a77bf5463493c593ed1968f996e3f45b26345b5e86942b5e5811562415a3271		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 5160 bytes
font_01_sfnt_off000101c9.bin
bdf4ebb65da0d9001d4050514723fc06677538f606667cb96f3eb58ab223a2af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 11448 bytes

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