Malicious PDF — malware analysis report

Static analysis result for SHA-256 2504fcddf2fe3c47…

MALICIOUS

PDF

77.9 KB Created: 2021-02-27 16:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: d9e73ecf0b95bc101aa286f71d8787f8 SHA-1: d8f55c02c198ceecae7a8ab26330ca99caf652a9 SHA-256: 2504fcddf2fe3c47a5f56a2267b264a1e4b048b368696aff234179496fd115db
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical finding for a PDF link farm and ClamAV detection as a phishing trojan. The embedded URLs and the document body, though heavily obfuscated, suggest an attempt to direct users to external sites, potentially for phishing or to host malicious content. The presence of numerous external links points towards a link farm or SEO manipulation tactic.

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
  • 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.
  • 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://resalured.ru/strik?utm_term=how+to+break+into+speed+queen+commercial+dryer PDF link annotation
    • https://cdn.sqhk.co/xipuzotekela/icijbhg/dominos_deal_large_pizza_5._99.pdfIn PDF document text
    • http://topchambre.xyz/anyway_you_can_annette_bosworthaaf13.pdfIn PDF document text
    • http://nout-prokat.website/jisiroxixiditomikegub93jo9.pdfIn PDF document text
    • http://testersairf.xyz/75632827516ng3hu.pdfIn PDF document text
    • https://fuxopejebema.weebly.com/uploads/1/3/4/0/134018858/577e229b9976.pdfIn PDF document text
    • https://lekevemu.weebly.com/uploads/1/3/0/7/130776436/dogoravuzitabozo.pdfIn PDF document text
    • http://ca-management.website/c5_envelope_die_cut_templateacywy.pdfIn PDF document text
    • http://abanca-electronica.com/aruba_215_access_point_manualouf14.pdfIn PDF document text
    • https://felipivi.weebly.com/uploads/1/3/1/8/131856333/gufuwelipaj-padow-befisikolagi-pigazezakofevu.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/SmU3jhC/xunepugizowatoxewufap.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
    • https://s3.amazonaws.com/fajonubinomeder/wozujidufukubosirovel.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/apache_camel_developer_s_cookbook.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/yufuin_floral_village_japan_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/sedikonewigudipawi.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/letuvejijiwow.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/47886751537.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/java_programming_interview_questions_for_freshers.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/10741539162.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 5588 bytes
SHA-256: 5478e7023100ab6ed91a4e6ca4a81b4650fcd45278f323a9def008eeeea1ee79
font_01_sfnt_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 11096 bytes
SHA-256: c0fccc874e196b9095ce8ca630182e552ef41e43593dab14408fd2baebfe4bc1
font_02_sfnt_off00011bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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