Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1051d5a481cb71c…

MALICIOUS

PDF

71.9 KB Created: 2021-01-10 01:54:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: eccb0556f3f2dd35e9601e734cdcc830 SHA-1: ef94c60f50b5f63c79921558b17581e93a1e4907 SHA-256: d1051d5a481cb71ca658334504f064cb11301dd6bf6aae9bca361dfee655269e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. 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 embedded links suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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
  • 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://gettraff.ru/123?utm_term=chemistry+equilibrium+worksheet In PDF document text
    • https://site-1168170.mozfiles.com/files/1168170/socialgest_es_gratis.pdfIn PDF document text
    • https://site-1171112.mozfiles.com/files/1171112/luke_bryan_duet_song_list.pdfIn PDF document text
    • https://cdn.sqhk.co/kosuxatune/Ehbhhhf/wizabodifapeta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409806/normal_5fb4ce710c5a6.pdfIn PDF document text
    • https://cdn.sqhk.co/kufejeni/dAgjZMY/to_the_moon_and_back_lyrics.pdfIn PDF document text
    • https://site-1216774.mozfiles.com/files/1216774/clt_full_form_in_english.pdfIn PDF document text
    • https://site-1187532.mozfiles.com/files/1187532/word_connect_payout_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/RERibhb/fevijonelodulu.pdfIn PDF document text
    • https://site-1236897.mozfiles.com/files/1236897/multiple_child_chore_chart_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472475/normal_5fb967139c2ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470553/normal_5ff551d3dde0b.pdfIn PDF document text
    • https://site-1174928.mozfiles.com/files/1174928/lanedukuguguzifekafuma.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/cgchhLB/smart_hashtag_generator.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://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_off0000cd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4F 5040 bytes
SHA-256: 9e7715804be29a4505defbd417712b641dcd989743709ad96140a44b862923a0
font_01_sfnt_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 11212 bytes
SHA-256: af165fa9e9a2deab41aa8874411c5accd840b683b3fdbea788ca02961d785cfa
font_02_sfnt_off000104bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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