Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f02a33f079f137…

MALICIOUS

PDF

66.7 KB Created: 2021-03-23 02:04:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1067ea149d44e92815dfe7a02e5069f5 SHA-1: af7d2cf7cde178a00ebbdb383e361440a32b6ad8 SHA-256: 56f02a33f079f1375399cf17619bd0f00b713729b45bbc4df9b3ed8e91b012b8
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious sites.

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
  • 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.
  • 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://ponafet.ru/award?keyword=verbier+hiking+map+pdf PDF link annotation
    • http://rinujajija.getenjoyment.net/how_to_use_timer_on_timex_ironman_watch.pdfIn PDF document text
    • https://cdn.sqhk.co/xebosulog/aXJLQih/o_que__movimento_uniformemente_acelerado.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/a5yi00R/vomaniv.pdfIn PDF document text
    • http://fezelaradelemuj.22web.org/permutation_and_combination_aptitude_questions_and_answers.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/tepuvemejukujexoler.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/jhquFjf/mineral_wells_high_school_football.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/Ujh3jh8/25383917349.pdfIn PDF document text
    • https://cdn.sqhk.co/miviterul/gPiijgw/rocketball_championship_cup_hile_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jasojime/ig9KAii/99209880179.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kobuxotaregudes.rf.gd/gazixosuzobe.pdfIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_117df0e9692f49a39f5bd4a89cd4bde0.pdf?index=trueIn PDF document text
    • http://sadoboxijowem.myartsonline.com/49875524362.pdfIn PDF document text
    • http://dipagepe.atwebpages.com/70898564213.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_93ae5225515c487f96507aaede6fa93a.pdf?index=trueIn PDF document text
    • http://soranodabiwegi.myartsonline.com/25596906117.pdfIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_81f15da2d4c44ce4be356e4ee33c4fea.pdf?index=trueIn 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_off0000c6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E0 5416 bytes
SHA-256: 9832296be952ac4b03aac1cdfc890a57173d5f253ce3fe8acf7f4c219808d29f
font_01_sfnt_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 11172 bytes
SHA-256: 283cd184695a35d8ebd4a3acb090c513c41f13a91101857fe1b2659930657f59

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