Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13d9308882f2168…

MALICIOUS

PDF

72.3 KB Created: 2021-03-20 18:26:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e0040fd31573969c5b45312b919b187e SHA-1: 3802f8f01cb5a318ed82c8d5ceaf50a49909bf5c SHA-256: f13d9308882f21686e05beb9852d4a66e8febb9509259f66bd17589109f6ea40
156 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm or SEO manipulation, as indicated by the PDF_SEO_LINK_FARM heuristic firing and the presence of numerous external URLs. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wix?keyword=usatestprep+answers+science+7th+grade PDF link annotation
    • http://galosidijixiwu.mypressonline.com/convert_2d_autocad_drawing_to_3d_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420756/normal_6041aaab3fc70.pdfIn PDF document text
    • http://naxaliref.iblogger.org/what_are_some_examples_of_conflicts_of_interest.pdfIn PDF document text
    • http://zoxulojiliboro.22web.org/cisco_ccna_book_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367680/normal_5feffadfde7de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_604197cb08f4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446759/normal_600d8accd6abb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vukekabexipog.rf.gd/how_to_tell_if_a_binary_compound_is_ionic_or_molecular.pdfIn PDF document text
    • http://zegapoja.epizy.com/baby_einstein_neighborhood_symphony_jumper.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/farasore.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/guild_wars_2_skyscale_medicine_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/business_proposal_sample_format.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/surviving_the_dust_bowl_video_answers.pdfIn PDF document text
    • http://fejonaxi.myartsonline.com/renfe_cercanias_madrid_mapa.pdfIn PDF document text
    • https://5ec50ee2-6c76-415b-b731-82d7de26534b.filesusr.com/ugd/826e74_3ad7d01b9e414edab4d886f5b06f3c75.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jifesu/gomufawiruwakazekedolive.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/xofebixowapenuwar.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/31727142742.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/jenerasefolerepusa.pdfIn PDF document text
    • http://gipenebome.epizy.com/dungeons_and_dragons_5e_character_sheet_generator.pdfIn PDF document text
    • https://b9b086bb-db5c-4c47-b99c-4ca3d8c772c1.filesusr.com/ugd/c090b7_9bfc13188fc542bb82ebdb43e8b58e07.pdf?index=trueIn PDF document text
    • http://solejow.myartsonline.com/6th_grade_spelling_words.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_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 5468 bytes
SHA-256: 7421e0994a86ffe8089c4ca0d3eab679f584c400de6f45e51b000ccf50463df8
font_01_sfnt_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 10592 bytes
SHA-256: f35493840267ccc9ba701979dac96c0d8fcfbe9e35309983a3eee8eda7546ed7

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