Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a244058f5d00d78…

MALICIOUS

PDF

74.3 KB Created: 2021-01-31 22:40:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0ee1fad0a28a3a6b48a3799d79ad787f SHA-1: 25b31c05978a1deffb6fc9e591b632efda544112 SHA-256: 9a244058f5d00d789f3f3bc0bb45e203bcf90bfa05a7a319a5921bc32127a282
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or using UTM parameters, indicating a likely phishing or scam campaign. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure.

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://leonvi.ru/aws?utm_term=blackmail+movie+1973+song PDF link annotation
    • http://stavki-na-sport.site/25005583514k90l8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468289/normal_5fce84c1a2aaf.pdfIn PDF document text
    • http://discovljzg.fun/oscar_grant_iii_wifeye72j.pdfIn PDF document text
    • http://jodopafipunew.22web.org/cgaffinetransformmakescale_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/tatiderubota/gL7heif/24773059094.pdfIn PDF document text
    • http://scandisvet.ru/65243273800y1x8w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463034/normal_5ff64a5c2f07d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422643/normal_600962e527919.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jepojofugag.rf.gd/husqvarna_automower_user_manual.pdfIn PDF document text
    • http://derekage.epizy.com/59875841982.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/tewasubi.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/child_care_subsidy_guidelines_ontario.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/27704382356.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_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 5648 bytes
SHA-256: 576bdae64822f4d3f60df1f32ee4f2722bdd59cbba8f1098f9cccb9e364bb729
font_01_sfnt_off0000f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 10780 bytes
SHA-256: 14a6be83a596a9d34e661e3c7a46b51c10ce0b3a9d77364238a389ea7d5d8b10

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