Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fe82301407eddf…

MALICIOUS

PDF

71.0 KB Created: 2021-01-27 10:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: eeaf182cdda9d7be0189ed643337d9ac SHA-1: 261bf4877d7b3e2022306f897394413544cb5ce3 SHA-256: a7fe82301407eddfb2f4855945b25615a6685fb294f025d0be498b417c784b32
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirectors, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious redirector pattern, likely serving as a lure for further compromise.

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://crophysi.ru/aws?utm_term=short+a+sound+worksheet+for+grade+1 In PDF document text
    • https://cdn.sqhk.co/finelega/ghAmzgg/best_cloud_browser_ios.pdfIn PDF document text
    • https://zenanewexakidop.weebly.com/uploads/1/3/5/3/135310893/8675546.pdfIn PDF document text
    • https://cdn.sqhk.co/fobonelaga/a6nl07T/growtopia_can_t_change_password.pdfIn PDF document text
    • https://cdn.sqhk.co/jitolado/8iajbij/gesiferakavajupamituzuw.pdfIn PDF document text
    • https://cdn.sqhk.co/bunewonu/jc59Dje/dotutageveluvuwi.pdfIn PDF document text
    • https://cdn.sqhk.co/jilijibimi/jfvmbLy/1st_grade_activities_on_zoom.pdfIn PDF document text
    • http://kmplitka.shop/kepusuxusu65ir7.pdfIn PDF document text
    • http://socialwave.me/fekelidajorovipanksnv2.pdfIn PDF document text
    • https://cdn.sqhk.co/warugariluxe/ihjgid1/516474591.pdfIn PDF document text
    • https://cdn.sqhk.co/kofosenolo/jdlPhaf/photomath_app_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/ifieihK/28166431125.pdfIn PDF document text
    • https://toxilitabosi.weebly.com/uploads/1/3/4/4/134495834/jozoroje.pdfIn PDF document text
    • http://swast-group.website/linamipogepotolugurff12q.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/fheGRjf/69253162574.pdfIn PDF document text
    • https://purelukanixavaj.weebly.com/uploads/1/3/1/4/131454065/d7b6c14e74a.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/kudefem/sodij.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_off0000ce51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE51 5448 bytes
SHA-256: b40666f29a28e803b6b6c68b4d8b65626ed17f316e0a5bd29fe109763b22d75b
font_01_sfnt_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 10764 bytes
SHA-256: 43bb51e1b75b00d1f0b3711ee414ad1964aae2dbb831dfe7bdde35fb4f25f83a

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