Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb9f39a91e317c3…

MALICIOUS

PDF

69.8 KB Created: 2021-01-26 08:20:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3b38e9589ce627e170ae24454904d526 SHA-1: 3257e818c2768ece9f9b49ba30d98b6cc0dcf14a SHA-256: 4eb9f39a91e317c38a4a2f5f495839aaca44764b60f4948dcb01b242cce198e1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful 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://trafffi.ru/123?utm_term=lisle+high+school+ranking PDF link annotation
    • http://onesmall.space/74842924793tne1e.pdfIn PDF document text
    • http://agreevudb.rest/the_amazing_claw_machine_as_seen_on_tvmsyas.pdfIn PDF document text
    • https://xilasofuvi.weebly.com/uploads/1/3/4/6/134651230/766090ee7.pdfIn PDF document text
    • https://lefiletigej.weebly.com/uploads/1/3/4/5/134597596/2114439.pdfIn PDF document text
    • https://cdn.sqhk.co/fijumirana/jdQhbfs/32237098766.pdfIn PDF document text
    • https://xafasujogi.weebly.com/uploads/1/3/4/3/134374351/tenizogumam.pdfIn PDF document text
    • https://betetaguzom.weebly.com/uploads/1/3/2/3/132303315/cec0df615b4f.pdfIn PDF document text
    • https://femuxejafedanib.weebly.com/uploads/1/3/2/7/132740958/tilebiwu.pdfIn PDF document text
    • http://dreabling.online/monkey_ball_race_gameqsoi9.pdfIn PDF document text
    • https://labopepiw.weebly.com/uploads/1/3/4/7/134747507/703934.pdfIn PDF document text
    • http://50offshop.info/diversion_meaning_in_english3g8db.pdfIn PDF document text
    • http://likelid.xyz/meals_on_wheels_bronx_nyafs2s.pdfIn PDF document text
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/60647a63918af6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/somisilegex/gujepofire.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/gnucash_invoice_stylesheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/dagufekikarutixipo.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/best_android_root_apps_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/welorefasatuparunizum.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_off0000d4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 5068 bytes
SHA-256: 2ad2ac9a1897d04b6a8f4b25fd42e598baec32af85e51404a012fdefda94d60f
font_01_sfnt_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 10536 bytes
SHA-256: a60b7af940bb5c5d0aa8100d29bbfa355c6818daef4d85b5ef1334cc677aa71a

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