Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a66528936333a6b…

MALICIOUS

PDF

82.5 KB Created: 2021-01-25 14:38:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: da61fc5bafb6f054825f3cac35edd8b4 SHA-1: 94817c8db1258bd190698634bee029eebe444eb9 SHA-256: 4a66528936333a6b2b3986b52638b064e373b3fa1eef0d1f91d455abd8c9eda1
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to various domains, many of which are disposable or known redirectors. Heuristics indicate this is a malicious redirector and a link farm, suggesting the document's purpose is to drive traffic to potentially malicious sites or for SEO manipulation. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://traffmen.ru/aws?utm_term=bonding+pvc+sheets In PDF document text
    • http://vk-settings-change.online/yellow_line_paint_removeruuhbq.pdfIn PDF document text
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/2378254.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/gjohfjg/dragon_ball_legends_anti_regeneration_team.pdfIn PDF document text
    • https://joxedobiwot.weebly.com/uploads/1/3/5/3/135350216/8268966.pdfIn PDF document text
    • http://copyrightreports.com/69374155780ii4mx.pdfIn PDF document text
    • https://cdn.sqhk.co/vumatoxikom/3HjiihH/xosuzewezurunozanaluvob.pdfIn PDF document text
    • http://slmit.space/city_racing_3d_pcam838.pdfIn PDF document text
    • https://ruworelolovifuf.weebly.com/uploads/1/3/4/4/134462917/7e6d402387f003.pdfIn PDF document text
    • http://ighelpcenter.xyz/easy_way_to_learn_cnc_programmingexyin.pdfIn PDF document text
    • https://silorofolukut.weebly.com/uploads/1/3/4/2/134265947/jajusisomodo.pdfIn PDF document text
    • https://cdn.sqhk.co/nudabesawi/5ydhh6R/soccer_smash_cake.pdfIn PDF document text
    • https://tapizijivuvol.weebly.com/uploads/1/3/2/6/132696465/tabuwubenarowopage.pdfIn PDF document text
    • https://povaginomoti.weebly.com/uploads/1/3/2/7/132740536/sabupubenitu.pdfIn PDF document text
    • https://cdn.sqhk.co/gitaligido/hihKA9X/csr_racing_2_online_or_offline.pdfIn PDF document text
    • https://zoxexalibefan.weebly.com/uploads/1/3/0/9/130969973/sowodezodeb.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
    • https://s3.amazonaws.com/gazivemon/xixujipimajebaloxen.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/miwefuwok.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_off0000fa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 4892 bytes
SHA-256: 72a002ec7fda2386362c72069059e3033563cb96d7f99535dd99783a69a08d39
font_01_sfnt_off00010ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACE 10608 bytes
SHA-256: 61cf6b707acfc11e8d9eb23cc2e904599494e870ca8dfc3b604348dd6a4686c6
font_02_sfnt_off00012edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDF 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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