Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f117dff44d3968…

MALICIOUS

PDF

68.2 KB Created: 2021-01-15 04:38:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cde0f6ef435a5a06825f4e2fabb4763e SHA-1: e34fb24cddb9330eedefe0b3f231c2e96f20777a SHA-256: 45f117dff44d3968a9f02a7bef514fd2e24e03cecd378a3878f2225a9b26163c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicative of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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
  • 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://trafffe.ru/aws?utm_term=alsco+uniforms+catalog PDF link annotation
    • https://site-1175852.mozfiles.com/files/1175852/62561136068.pdfIn PDF document text
    • https://cdn.sqhk.co/perigupa/PViejS5/virus_killer_for_android_phones.pdfIn PDF document text
    • https://site-1171584.mozfiles.com/files/1171584/aliexpress_reviews_on_hair.pdfIn PDF document text
    • https://site-1167931.mozfiles.com/files/1167931/sabaton_carolus_rex_album.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/iifigid/2_player_pacman_unblocked.pdfIn PDF document text
    • https://zupuraba.weebly.com/uploads/1/3/5/3/135348036/3770072.pdfIn PDF document text
    • https://site-1168252.mozfiles.com/files/1168252/68747608469.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/dubutari.pdfIn PDF document text
    • https://site-1196452.mozfiles.com/files/1196452/buminonob.pdfIn PDF document text
    • https://site-1172650.mozfiles.com/files/1172650/spelling_test_practice_template.pdfIn PDF document text
    • https://site-1221974.mozfiles.com/files/1221974/grade_7_math_worksheets_with_answers.pdfIn PDF document text
    • https://site-1174658.mozfiles.com/files/1174658/mebasokasupoxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF48 5192 bytes
SHA-256: 169512087547a67cf52776d63edec9a42fab9259976689116425a387a293c7e6
font_01_sfnt_off0000e0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DC 10328 bytes
SHA-256: 6618ef0a5826e055551a509d19149e21a8fe7c52af8b53b86cb0e03367c53bb7

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