Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1df0b6bd56bc95a…

MALICIOUS

PDF

78.3 KB Created: 2021-06-01 04:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 26da0531b81c9467612531ee1479727f SHA-1: 4158cd0e283a1dfc8d4b5f2428d20b4083c81085 SHA-256: d1df0b6bd56bc95a2c77a0e93384cd898ae574aa13cefbb57fa0908b96ebfc40
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=chennai+express+full+movie++hd+300mb PDF link annotation
    • https://zebaraxofalolal.weebly.com/uploads/1/3/0/8/130813897/3607827.pdfIn PDF document text
    • https://votixired.weebly.com/uploads/1/3/4/6/134633812/7c16569928.pdfIn PDF document text
    • https://ravuripuzi.weebly.com/uploads/1/3/5/9/135958818/wanejeroluno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480886/normal_5fe6e256cc517.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4487409/normal_60b414f0dedeb.pdfIn PDF document text
    • https://xoxomedeze.weebly.com/uploads/1/3/5/3/135308121/mipizol_tudinokogoke_gakasesos_fisuj.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4372719/normal_60afeb3e9948c.pdfIn PDF document text
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/de7b6ec2.pdfIn PDF document text
    • https://gupamawuma.weebly.com/uploads/1/3/4/6/134602371/pexorigogitifej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475727/normal_5fcb9b809acee.pdfIn PDF document text
    • https://biteganeger.weebly.com/uploads/1/3/4/3/134369481/walorerosoka-dikanis-menuforivudikab-rofasebop.pdfIn PDF document text
    • https://xenolato.weebly.com/uploads/1/3/4/8/134868471/rogonaloke.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4413976/normal_60b398eb9ed92.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/9481643.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pokuwatosat.pbworks.com/f/jukarujagopuderiworikor.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/w/file/fetch/144432732/ranuroj.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144423651/muferixabenekux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/826fca4a-c45b-4ddd-9f81-a02eaab765b9/12694453554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b42ba72-2f33-4ea6-a407-9f95441c4814/50885946615.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/144432783/23290206269.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144420123/piramuxudilawijomemom.pdfIn PDF document text
    • http://zajozote.pbworks.com/f/tojutiwokadojilokapof.pdfIn PDF document text
    • http://fadoposapat.pbworks.com/f/13084060502.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 5760 bytes
SHA-256: 0da5d53ea9245efbf60670af4b69e2eb79bc3f4e4307745749fd3b219f24d090
font_01_sfnt_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 10620 bytes
SHA-256: 58b35994d967089a184937194d53e8796ef623d19b4411319782b1f547f276b8
font_02_sfnt_off00011539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11539 16060 bytes
SHA-256: 4c0a3f0893f5e69c6acf0c6b7f036872587aec6188c41bdd40a009ab43c82216