Malicious PDF — malware analysis report

Static analysis result for SHA-256 822313584135b4fb…

MALICIOUS

PDF

68.1 KB Created: 2020-11-11 10:20:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ebd704736566bfd06c67906cbc453a51 SHA-1: d7bd8d99dbc898fed15b288366882adf685bb540 SHA-256: 822313584135b4fb07c5698f8485562e06e14e01a9a708da9e98692675577a0b
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 0.9998

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://trafffe.ru/123?keyword=how+to+get+your+website+noticed+for+free PDF link annotation
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/xumupafav.pdfIn PDF document text
    • https://nosilagime.weebly.com/uploads/1/3/4/6/134613039/pazixebitugebab-vikid-texamexejekovu-baveduxedoguwe.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/1c3180a5bee1d84.pdfIn PDF document text
    • https://mibonapa.weebly.com/uploads/1/3/4/3/134308174/wuresiwe.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/9ecc6771f91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408976/normal_5f9ee1c348e39.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/zewilifewel-jaruz-dilelarenuk.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/gupuso/dawup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8358e5c4-f1bb-481f-aed7-cc35e16b9304/detagumom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2bc39d8-34da-44b1-9385-7d3c54dd3d07/zepuwewefojawasaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc5aa436-ca7a-4161-b755-0f2fc6bb03ef/warrior_cats.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_off0000ce0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0B 5240 bytes
SHA-256: 3e66002d063084634875edce1b1017aec9a0446b0181a9f37f8c491b6ccea265
font_01_sfnt_off0000e00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00B 10424 bytes
SHA-256: cd871570346ca681060e65a705ec98e51cb6b95bf7a0d393c7e75112f86384be