Malicious PDF — malware analysis report

Static analysis result for SHA-256 01aa2af1acd9a353…

MALICIOUS

PDF

74.1 KB Created: 2021-06-14 09:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4cac51f9fc2c521d04926d952bd915de SHA-1: c8e92d40a57692e4af0d6a7fd21780a4a1790e53 SHA-256: 01aa2af1acd9a353199d1eea94aedc3fd850cd1b009320cbab3904e3c1c2874c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms used in phishing or to distribute further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one pointing to 'http://xuresasadox.pbworks.com/f/lafepod.pdf'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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://dafemum.ru/123?utm_term=google+classroom+2019+cheat+sheet PDF link annotation
    • https://xajuvafi.weebly.com/uploads/1/3/4/6/134634088/d6ba1a686c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392191/normal_60064d7f80e48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417321/normal_603b1405b9240.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366623/normal_60018e3feb745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392652/normal_60323b1595220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_6061d3b93e6fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417818/normal_6038615096717.pdfIn PDF document text
    • https://lopekemin.weebly.com/uploads/1/3/4/6/134628767/4423089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444636/normal_601b8406123b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505687/normal_602dfba5dee74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_60c14cc06db65.pdfIn PDF document text
    • https://bixilojod.weebly.com/uploads/1/3/0/8/130813790/wupuzewetida.pdfIn PDF document text
    • https://bisifivu.weebly.com/uploads/1/3/4/7/134724717/fugenak-sakokux-lisukox-diwujuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475194/normal_601b0160e3fcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480750/normal_6006e7ff23087.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/suniga-vubaja-mudam-fuvopexo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379477/normal_5fde6f7db1458.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xuresasadox.pbworks.com/f/lafepod.pdfIn PDF document text
    • http://wevapejatu.pbworks.com/w/file/fetch/144644451/unacademy_mrunal_economy_2020_fees.pdfIn PDF document text
    • http://varulemenel.pbworks.com/w/file/fetch/145284774/bubble_white_saga_3_mod_apk.pdfIn PDF document text
    • http://geviwesizar.pbworks.com/f/download_windows_iso_file_for_mac.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 5360 bytes
SHA-256: e971539727a0768660178e5c118d712efa15b9df16a3d914ac4e48d3b5dd9857
font_01_sfnt_off0000e873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 10524 bytes
SHA-256: 8199286c938ebb4459183f9b3476c85634c84fd7789e2da1cdf3802bf15f6734
font_02_sfnt_off00010c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C78 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c