Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83a63332a097209…

MALICIOUS

PDF

66.8 KB Created: 2021-01-13 13:30:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0171240f7a1a4202b1ec039522860534 SHA-1: 28bf3438f97d5a9847c0ff80ca620986ffc6514d SHA-256: e83a63332a0972099e385546d9e792468673f7d7c3cb4e2e6dd44857fe54f890
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure (ggtraff.ru). The document structure suggests it's designed as a link farm on disposable hosting, likely to facilitate phishing or malware distribution. No scripts were extracted, but the presence of malicious links is sufficient evidence of a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/wb?keyword=wallpapers%20for%20computer%20fall In PDF document text
    • https://static.s123-cdn-static.com/uploads/4460706/normal_5ff37c3311bfa.pdfIn PDF document text
    • https://site-1168144.mozfiles.com/files/1168144/turkey_burger_time_on_grill.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/888cb5647.pdfIn PDF document text
    • https://cdn.sqhk.co/webepinovet/c7icY2e/slot_car_tracks_for_sale_australia.pdfIn PDF document text
    • https://site-1168148.mozfiles.com/files/1168148/xenowerk_tactics_apkpure.pdfIn PDF document text
    • https://site-1168340.mozfiles.com/files/1168340/last_christmas_movie_parents_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416789/normal_5ff364f737a6d.pdfIn PDF document text
    • https://site-1173933.mozfiles.com/files/1173933/zafegirimiwekekabateka.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/LgcPjhW/77826015465.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/YNji99o/daily_chores_meaning_in_urdu.pdfIn PDF document text
    • https://site-1168218.mozfiles.com/files/1168218/amazon_driver_jobs_raleigh_nc.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/sinamozagemoger/bibliography_citation_mla_format.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/dota_ancient_apparition_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/miss_mary_mack_song_baby_tv.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_off0000cb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB67 5176 bytes
SHA-256: 77fcfe73c14ca9bdce320ffa42cfe24d0f4e4c60937837188f5375d4cdb84709
font_01_sfnt_off0000dcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFA 9856 bytes
SHA-256: 829ebd7bea3ddef708b5bcb8f21923b0244ffa56fbe1a851da157f0ace03d85f

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