Malicious PDF — malware analysis report

Static analysis result for SHA-256 f421767cdbfcf676…

MALICIOUS

PDF

74.6 KB Created: 2021-03-02 18:12:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b4444c435ee13ccb0b328bf5fc67545f SHA-1: 536cc463f9bb7bd70d3c4638c5a6d9ec322ae2f0 SHA-256: f421767cdbfcf6763888afb8ebc2acf84879b32e3ba83ad5230ac6483dd362ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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 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://seumenha.ru/wix?keyword=springsteen+tour+2020+london PDF link annotation
    • http://albl.ru/vubuwodawesulufoxeregakatolq41.pdfIn PDF document text
    • http://pixerofojoka.22web.org/72505469326.pdfIn PDF document text
    • http://infonewstravel.com/wowatowaq7lqr.pdfIn PDF document text
    • http://just-gopro.com/download_film_irani_metri_shisho_nimc89lm.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/65286120530.pdfIn PDF document text
    • http://molipetofokeva.22web.org/what_is_a_minimal_set_of_functional_dependencies.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/ponapujetanam.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/Dqgfibj/87176793493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_603b702fa7a6e.pdfIn PDF document text
    • http://ecoterritory.store/pisotevexuruwop2hetv.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/how_to_check_chainsaw_chain_size.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sutexuvidag.myartsonline.com/96624142036.pdfIn PDF document text
    • http://puwokamavureme.rf.gd/cross_platform_mobile_react_native.pdfIn PDF document text
    • http://boxowuwomorekuj.epizy.com/7760773564.pdfIn PDF document text
    • http://voperafabekom.epizy.com/160_bus_schedule_nj_transit.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_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 5296 bytes
SHA-256: 34d86d53d125debe396b3bcc0ab13d173f423b770b72b4602b4d700c68c0a16b
font_01_sfnt_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 10240 bytes
SHA-256: 2e0499a8a03731c348517afab958855e5d43dabc082bd496ec00f72612fd2574