Malicious PDF — malware analysis report

Static analysis result for SHA-256 623a11afc67ebb8e…

MALICIOUS

PDF

72.6 KB Created: 2021-01-29 17:25:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0a58645f8fcb0b6c872eed97e5418617 SHA-1: 83d23e9598923ebfb75decd31c7fe86ab4574a86 SHA-256: 623a11afc67ebb8e82571525118fcda0d5509091dfa410276c64572f689099fb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. Although no scripts were extracted, the presence of many external links points to the document's role in redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://traffset.ru/wb?keyword=free%20halloween%20among%20us%20skins PDF link annotation
    • http://ximikilanad.22web.org/80461103858.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393762/normal_5fc9b27a3d0cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474746/normal_5feeee048fc45.pdfIn PDF document text
    • http://zakofuta.66ghz.com/49217257713.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367914/normal_5fcff3a5043a0.pdfIn PDF document text
    • http://verenica.net/4359758368hs1hp.pdfIn PDF document text
    • http://alphabitx.com/digonitepemevigilazuhbljq.pdfIn PDF document text
    • http://arevakar-travel.com/skyrim_face_presets_racemenug5fa2.pdfIn PDF document text
    • http://afterdealer.pro/deriloworud0abtq.pdfIn PDF document text
    • http://sacredname.ru/blacksad_sketch_files7gc2k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_5fd7d076ab151.pdfIn PDF document text
    • http://instapriz24.online/plane_tickets_to_vegas_from_seattleduvz5.pdfIn PDF document text
    • http://eurofamily.pro/60460671979taj9r.pdfIn PDF document text
    • http://coolmag.biz/football_clash_all_stars_hackn1fxj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bomemab.epizy.com/affitto_casinalbo_formigine.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_off0000df0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 5208 bytes
SHA-256: 48c0c7cce3770679e37803151e6c527d3735262250ec4b3fcfe3b5a50d1a1f77
font_01_sfnt_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 10872 bytes
SHA-256: 2ded35d93f0c2c6694c33e0b46b7ccb82b68f3e9496f237bda2feb8efa1f860b

Open this report in the interactive analyzer, or submit your own file for analysis.