Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8b13534c6f1a05…

MALICIOUS

PDF

85.9 KB Created: 2021-06-08 03:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2ae590dda378a9071d71acc2070e1d96 SHA-1: 597133542615ac02f0dff41f6320d324f41e9c6c SHA-256: ad8b13534c6f1a0546fb7942fc623bad3ba378af872c28ec9f64899b7893a6b9
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://smidgel.ru/pbw?utm_term=redoks+tepkimeleri+denkle%25C5%259Ftirme+%25C3%25B6rnekleri+%25C3%25A7%25C3%25B6z%25C3%25BCml%25C3%25BC+sorular PDF link annotation
    • https://zadejafiton.weebly.com/uploads/1/3/0/8/130813032/b2cdaa781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375503/normal_6023f9de34996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500895/normal_606da3d43366a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381759/normal_60286e755e4e4.pdfIn PDF document text
    • https://sofakixejiz.weebly.com/uploads/1/3/4/2/134265497/lapuwilu.pdfIn PDF document text
    • https://didejigoximatex.weebly.com/uploads/1/3/1/0/131070501/fadixiti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368224/normal_5ff262548d99c.pdfIn PDF document text
    • https://lowutifita.weebly.com/uploads/1/3/4/3/134352456/9048710.pdfIn PDF document text
    • https://futivodefumir.weebly.com/uploads/1/3/4/8/134861147/jewilife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452154/normal_603faaaf70f8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474445/normal_5fda8f672fd4d.pdfIn PDF document text
    • https://zojujevekuki.weebly.com/uploads/1/3/0/9/130969212/daxizilolike-teliduleponezu.pdfIn PDF document text
    • https://butafujedixixi.weebly.com/uploads/1/3/4/2/134236167/sopetuxexodarobaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_6057a71f47124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403672/normal_6049afea7431d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mudowomuxexo.pbworks.com/f/pijejodesafa.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/f/70257942891.pdfIn PDF document text
    • http://garigor.pbworks.com/f/jevepakudat.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144758865/49036898909.pdfIn PDF document text
    • http://wurutaw.pbworks.com/w/file/fetch/144649521/mikandi_gold_mod_apk_free_download_for_android.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/f/18780186917.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/w/file/fetch/144644301/pokemon_deluge_rpg_cheats_level_100.pdfIn PDF document text
    • http://bobiginokemo.pbworks.com/w/file/fetch/144725295/a_haunted_house_hollywood_full_movie_in_hindi_dubbed.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_off0000f5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 5912 bytes
SHA-256: f512fc151628bd747f2524ade0fd3bcad46a023b6559a63ca1efaaefd77df44c
font_01_sfnt_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 12828 bytes
SHA-256: 0370c12d67c82290be8c301bc5cd632c1c06fff1794ac9df331ce453966f8c40
font_02_sfnt_off00013166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13166 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e