Malicious PDF — malware analysis report

Static analysis result for SHA-256 734d01dff4bfe45b…

MALICIOUS

PDF

82.6 KB Created: 2021-02-16 06:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 21ba6934c6ca1d3ea5ca67924cbfd392 SHA-1: e825b4ce69f9bc7911aff3715a923c6dde2b2969 SHA-256: 734d01dff4bfe45b2cdb3b1036df3282bbd43134d3aad9da11a7647ea31d0121
126 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 URLs, many of which point to disposable domains and are likely part of a phishing or link-farming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://crophysi.ru/123?utm_term=top+10+machine+learning+algorithms+for+beginners+pdf PDF link annotation
    • http://sorekivobu.22web.org/balettan_movie_songs_free.pdfIn PDF document text
    • http://detonic-romania.website/mukelojidu12l70.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/28315282077loz2k.pdfIn PDF document text
    • https://komanogorolelew.weebly.com/uploads/1/3/1/3/131380356/945a25ed630b6.pdfIn PDF document text
    • http://taxurofetizi.22web.org/dukakuvuxozotigajewujared.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_601221d360874.pdfIn PDF document text
    • http://ozalupa.space/cloud_computing_basic_interview_questions_and_answers9o9pq.pdfIn PDF document text
    • http://clebohets.xyz/desolezuf00jv1.pdfIn PDF document text
    • https://jasugigikimodo.weebly.com/uploads/1/3/1/3/131383258/1238065.pdfIn PDF document text
    • http://bu-markett.com/581409818515gu0d.pdfIn PDF document text
    • https://kavekoda.weebly.com/uploads/1/3/5/3/135326791/wifefavavel_dujez.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/dudigonifu/gegifuwobupegekew.pdfIn PDF document text
    • http://javasuk.epizy.com/zedadoxerivif.pdfIn PDF document text
    • http://lumawasisoxo.rf.gd/colorado_buffaloes_football_uniforms_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/china_real_estate_bubble.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_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 5852 bytes
SHA-256: 1fad8c991f0ebde923c19c5aa01073e41be2a8a31825b715163f665058292a90
font_01_sfnt_off0001151f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151F 11816 bytes
SHA-256: c5d49f1a6102f8957265270e8ee37a9be710fe5a4539067c688b29a9f90ba7b6

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