Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c3fa846a71c606…

MALICIOUS

PDF

75.0 KB Created: 2021-03-27 22:30:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 448ef710aa3c45175c774a7567ed8342 SHA-1: 27c53d9e791dd786e0c5684884beca5b7888f611 SHA-256: e1c3fa846a71c60606b0736de3d500ff46a569ea1a2c8e6d05438afc2b12858a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are part of a link farm, indicating a malicious intent to redirect users to external sites. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution tool. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://zajinet.ru/strik?utm_term=sample+gm+diet+plan+day+4
    • http://ecoterritory.store/168194743518h7a.pdf
    • https://cdn.sqhk.co/piwizogir/ghjihdd/31929133326.pdf
    • https://cdn.sqhk.co/gijosevozu/ghAn5gf/crossword_puzzle_word_game_free.pdf
    • http://anrostore.ru/uc_browser_2018_appz5lz8.pdf
    • https://pesulomerusetus.weebly.com/uploads/1/3/4/1/134109359/08d5bf9b646cf9.pdf
    • https://cdn-cms.f-static.net/uploads/4466146/normal_603f30c11b97c.pdf
    • https://cdn-cms.f-static.net/uploads/4403422/normal_604d97564fc9e.pdf
    • https://cdn-cms.f-static.net/uploads/4453888/normal_604b44da0118c.pdf
    • https://cdn.sqhk.co/naluloli/je6jggg/79862110160.pdf
    • https://wixoxane.weebly.com/uploads/1/3/4/7/134734379/5412218.pdf
    • https://jetebudatupa.weebly.com/uploads/1/3/4/7/134748577/6186462.pdf
    • https://nizifaweneli.weebly.com/uploads/1/3/4/5/134589853/3512300.pdf
    • https://cdn.sqhk.co/kagirukuki/62fjhij/bihari_video_gana.pdf
    • https://cdn.sqhk.co/nabotogemobe/Ajaijja/junobugo.pdf
    • https://cdn-cms.f-static.net/uploads/4470836/normal_601e7f45b7f87.pdf
    • https://zedurobarudavur.weebly.com/uploads/1/3/4/0/134018347/wotegebalake.pdf
    • https://cdn.sqhk.co/lejesapazud/UmMkgcd/offroad_racing_buggy_review.pdf
    • https://cdn-cms.f-static.net/uploads/4384301/normal_603435558aaae.pdf
    • https://cdn.sqhk.co/wuvevalor/8aVjhy5/91871907106.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e81c.bin
3b623539356b9e7ef1bc1c3d92768149f7dc794b2df9b8e7d26816085be0fcdc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE81C 5300 bytes
font_01_sfnt_off0000fa23.bin
857ed4baf8d15729db7a86e10c510a093111011fa328c51c3b4e0fd0246074dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 10840 bytes