Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa79bbfec5213daa…

MALICIOUS

PDF

85.9 KB Created: 2021-05-30 22:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87ac6e93c64dee506542ae4d4aebba78 SHA-1: 9baec38c1f91911bf9ae4d1c01dad032ca6d1f28 SHA-256: fa79bbfec5213daae2b2608bf0fa83da5def9ff543e4b01d2986e4daa48c36d5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host numerous URLs pointing to other PDFs, which likely serve as the actual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://botokaw.ru/strik?utm_term=endnote+x7+free+download+mac
    • https://cdn-cms.f-static.net/uploads/4391037/normal_603bd89418995.pdf
    • https://govalusazun.weebly.com/uploads/1/3/5/3/135325024/2847777.pdf
    • https://gozajajemitala.weebly.com/uploads/1/3/4/3/134325553/dofazigoduzi-tufupokebawiga.pdf
    • https://tuxinotem.weebly.com/uploads/1/3/4/8/134883911/keximip.pdf
    • https://static.s123-cdn-static.com/uploads/4367950/normal_5fca56d9d3a04.pdf
    • https://guzesunidami.weebly.com/uploads/1/3/0/8/130873942/ropizuluvajeroz-libufivowera.pdf
    • https://vozoduxi.weebly.com/uploads/1/3/2/8/132815828/misubunuluve.pdf
    • https://rerofijujujedo.weebly.com/uploads/1/3/1/8/131872137/duwijulefeb.pdf
    • https://xatotaga.weebly.com/uploads/1/3/4/7/134726025/ab06cf8394890.pdf
    • https://rurovipodi.weebly.com/uploads/1/3/4/0/134096689/2376001.pdf
    • https://cdn-cms.f-static.net/uploads/4367952/normal_6063d1a4f28d1.pdf
    • https://static.s123-cdn-static.com/uploads/4497356/normal_5ff0e94c552b3.pdf
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/sanizone.pdf
    • https://cdn-cms.f-static.net/uploads/4421615/normal_603ffb82ef45d.pdf
    • https://nejituxunexako.weebly.com/uploads/1/3/2/7/132712325/6c2e66187.pdf
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/2855095.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/5a72594f-0ec8-46f3-a7d1-b69c94ac8015/muzovawabipimenu.pdf
    • https://uploads.strikinglycdn.com/files/139a9f13-f216-47ee-bed3-c84ff92268b0/wogotevovipegomasuri.pdf
    • https://uploads.strikinglycdn.com/files/3483c23f-553f-4a41-9ca8-1f0ee77085f6/excell_pressure_washer_pump_exwgv2121.pdf
    • https://uploads.strikinglycdn.com/files/58caa3e1-c30d-43bd-99e0-fcf36006057f/how_to_drive_camry_in_sport_mode.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b7.bin
127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 6744 bytes
font_01_sfnt_off0000f69e.bin
254e3499940e746b8c6019b5249de44213a26b4fb23b2223d020d9aa2d724654
pdf-font-stream PDF embedded font (sfnt) at offset 0xF69E 4924 bytes
font_02_sfnt_off00010760.bin
c2822a840630a4936c5f1fdff4cc5abd51c5d7bbaf1e4a98f12bd93dcb69fd2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 24520 bytes
font_03_sfnt_off00013b80.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B80 4324 bytes