Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e74d50c31ff807…

MALICIOUS

PDF

76.9 KB Created: 2021-05-19 05:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 82c607bba242ea016678b48c9b7c70fb SHA-1: 9d711302fcf1da61c4b77610334569a9118fa22e SHA-256: 36e74d50c31ff807af74cb7e418d5f57f01a525bde4b0fb15ef897d1f9131628
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://soxebez.ru/strik?utm_term=suntrust+auto+loan+payoff+address+overnight PDF link annotation
    • https://tajixuxax.weebly.com/uploads/1/3/4/7/134751877/65fb9f1bc5d467.pdfIn PDF document text
    • http://tuworiki.22web.org/79143517100.pdfIn PDF document text
    • http://jitapikel.22web.org/mission_risk_game.pdfIn PDF document text
    • https://jerusofiv.weebly.com/uploads/1/3/0/9/130969981/3e146.pdfIn PDF document text
    • https://fadufavibog.weebly.com/uploads/1/3/4/8/134889314/dafalozagugonoj.pdfIn PDF document text
    • https://munibejexa.weebly.com/uploads/1/3/1/4/131414516/1202035.pdfIn PDF document text
    • https://fuxakitedev.weebly.com/uploads/1/3/5/4/135400966/cc45aba.pdfIn PDF document text
    • http://vujuxivawopigu.22web.org/adjektivdeklination_erklrung.pdfIn PDF document text
    • https://nifavoweju.weebly.com/uploads/1/3/0/7/130739528/2409973.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vibosaxijus.rf.gd/makalah_obat_analgetik.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/sawebuli.pdfIn PDF document text
    • http://minuwugonobusuw.epizy.com/automobile_technology_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/wigutonekemafoge.pdfIn PDF document text
    • http://subumopu.rf.gd/costing_sheet_transaction_code_in_sap.pdfIn PDF document text
    • http://nawexox.epizy.com/beyblade_burst_game_now.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/45801598195.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/kolevufixenizopekube.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_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 5568 bytes
SHA-256: 06a594db54aa963e9e8bc00789823f2f4d93db17e2054db46c94edfde0276c0f
font_01_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 11056 bytes
SHA-256: fd6ff46fa85bb7af5a371ec97da68e08042c219e6f0fa5ca933ec34bb32c30f1