Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a287b76e820c46…

MALICIOUS

PDF

91.9 KB Created: 2021-03-27 14:43:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3cfaf7f87e4422a08d31d2a04e1f6dd8 SHA-1: 9cf05be82e79fbaa05d3527ab0ee7d9dad7029cb SHA-256: 22a287b76e820c467cfa3c1a00278ec77f4fe1408be72590ebec64c81294a0f4
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 0.9996

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/wix?keyword=barrett+manual+training+high+school PDF link annotation
    • https://cdn.sqhk.co/pivokazi/j6gfUhe/wejoduvoxoj.pdfIn PDF document text
    • http://lowwsaw.xyz/black_and_decker_cordless_weed_wacker_charger137jz.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/e39ad.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/gjEgdgd/land_rover_off_road_experience_eastnor_castle.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/eWgcics/parent_portal_disd_donna.pdfIn PDF document text
    • http://yesnutural.space/21453530977v6wij.pdfIn PDF document text
    • https://cdn.sqhk.co/wirubetena/ehaxUgf/nasal_cannula_definition_wikipedia.pdfIn PDF document text
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/xenad.pdfIn PDF document text
    • http://triple-doska1.club/lucky_wheel_halloween_answerswejmy.pdfIn PDF document text
    • http://semengergel.ru/plantronics_backbeat_fit_350_user_guide8spxh.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzevunoxina/bgfLxvM/football_party_template_invitations.pdfIn PDF document text
    • https://fatofexar.weebly.com/uploads/1/3/4/6/134687548/b2ed95f383e.pdfIn PDF document text
    • https://gunobodupisar.weebly.com/uploads/1/3/4/6/134677737/rutawuke.pdfIn PDF document text
    • https://varijiligedag.weebly.com/uploads/1/3/1/3/131383591/f509791ef4066.pdfIn PDF document text
    • http://salopkisa.website/4019061588qr9ya.pdfIn PDF document text
    • https://paluwewokob.weebly.com/uploads/1/3/2/7/132712057/fuvovetinuwexuk_palefu_famijuninevi_kebomuxewo.pdfIn PDF document text
    • https://voxomusixexuso.weebly.com/uploads/1/3/4/8/134851372/5409465.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_61375ecaed2f4eba9842c3bfac1e67eb.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_e6a3fa0435eb43de858a911489f31dd5.pdf?index=trueIn PDF document text
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_bed802381ccd4fc28edb115cd2b56a2c.pdf?index=trueIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_bfc78587d09b407c8e3b209f3f7af8d4.pdf?index=trueIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_ad2821677a3b4ee2ac3d6aa3fc8e714a.pdf?index=trueIn 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_off00012a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 5264 bytes
SHA-256: 4d7fda58ac139fb915a370ec195d530081be4bdaf752c7f656be3329d9307643
font_01_sfnt_off00013bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD1 11120 bytes
SHA-256: a448fb3e60fd13333b494ec337abcd3983cdfade7c67c6a2e54c635d1ac74242