Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb87a7d8b523c13c…

MALICIOUS

PDF

82.1 KB Created: 2021-01-20 01:29:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ab7fd6139df77f3dfe14a7ae2cda0110 SHA-1: efa67e6b7a4324e1d42dffe622196ec5e31616e4 SHA-256: eb87a7d8b523c13c0c7988241c88369ccbefd51d566f78d57efdc0f918b26ccf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting and another pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://traffset.ru/123?utm_term=redding+study+guide PDF link annotation
    • https://cdn.sqhk.co/zetikitor/46ihy4m/wovedogabuwef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419218/normal_5fdbe789d2616.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/G7hewha/tisox.pdfIn PDF document text
    • https://site-1174866.mozfiles.com/files/1174866/stick_fight_animation_dragon_ball_super.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468554/normal_5fe97ff412c91.pdfIn PDF document text
    • https://site-1176370.mozfiles.com/files/1176370/fannie_mae_guidelines_for_delayed_financing.pdfIn PDF document text
    • https://site-1172306.mozfiles.com/files/1172306/django_template_count_list_items.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/iihjhjc/18405593859.pdfIn PDF document text
    • https://site-1171403.mozfiles.com/files/1171403/brazil_football_world_cup_song.pdfIn PDF document text
    • https://site-1227540.mozfiles.com/files/1227540/37530236781.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://vomajifinudunu.epizy.com/irregular_verbs_worksheet_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/38222023231.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_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 4536 bytes
SHA-256: 6751529f1bea0d5cc8fc298e919e8cc48985f1fb68ad157514bfebcafea6cf18
font_01_sfnt_off00010890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 10924 bytes
SHA-256: 558c55cef99d2092417edc4bdd8776758efe62c7f4fa95356dd67feb77e4ef26
font_02_sfnt_off00012d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D95 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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