Malicious PDF — malware analysis report

Static analysis result for SHA-256 8514d6f81bb394ec…

MALICIOUS

PDF

98.6 KB Created: 2021-03-16 12:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04f9f2a09f42f0b5ac9e68cc72218698 SHA-1: 24f4eb29f47c75f28a9d0b7737b1088436746d1c SHA-256: 8514d6f81bb394ecc67eedbd3767fea42cfed43e9c44d3be0dee5a7fc3126393
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one prominent link to 'vilenefex.ru' suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a lure to a malicious site, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=tarifvertrag+bundesagentur+f%25C3%25BCr+arbeit+pdf
    • https://static.s123-cdn-static.com/uploads/4379377/normal_5feb97339ae18.pdf
    • https://static.s123-cdn-static.com/uploads/4445104/normal_5fe17aae115cb.pdf
    • https://cdn-cms.f-static.net/uploads/4374535/normal_5fe6c7cfc5055.pdf
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/6182f427c7df.pdf
    • https://kalogipewaga.weebly.com/uploads/1/3/4/5/134595512/dusav.pdf
    • https://wizujepubenepax.weebly.com/uploads/1/3/5/3/135317151/xonizazofabize.pdf
    • https://cdn-cms.f-static.net/uploads/4487005/normal_60128496bef92.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zodawanuror/10591799782.pdf
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_378c228433ae4af8b58379a084b40451.pdf?index=true
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_90405c1ab4e24ae899f2b9733d460f4b.pdf?index=true
    • https://s3.amazonaws.com/gomaxod/mythologies_barthes_publisher.pdf
    • https://s3.amazonaws.com/dewutexorob/cuisinart_coffee_maker_ss_700_manual.pdf
    • https://uploads.strikinglycdn.com/files/8fa8612f-6dbf-43fd-9a99-242867cf5b4a/rexopotekisekugodowaragu.pdf
    • https://s3.amazonaws.com/vavapekadoliti/35083811554.pdf
    • https://uploads.strikinglycdn.com/files/e9ed06cd-5291-402a-88cd-a33fc9ed132c/mofirasokuxawutakit.pdf
    • https://uploads.strikinglycdn.com/files/5e5cc66c-f24b-4364-ad85-82ced1f763de/is_coding_dojo_worth_it.pdf
    • https://uploads.strikinglycdn.com/files/4001eb1f-ebfa-49e3-9393-03e3e41328fe/navedtra_14353a_2018_aviation_boatswains_mate_handler_abh.pdf
    • https://s3.amazonaws.com/fomaralunex/56014054329.pdf
    • https://s3.amazonaws.com/xuzed/bijofubukujewem.pdf
    • https://uploads.strikinglycdn.com/files/a58028fa-21cd-4974-b06d-69dd5fdfbf58/onkyo_tx-nr838_price.pdf
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_4873303c0bf3455085baaba10c496de3.pdf?index=true
    • https://s3.amazonaws.com/jadere/56563162262.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014031.bin
4b5ebe8dfadea1698df9cf6d21208ff3b3cffa527ff02a142a0d80f80b1eab9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14031 5448 bytes
font_01_sfnt_off0001529b.bin
3ce5dede35196ade1621877d60606779a180183a760ed9ec229f6d798f8bb8c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1529B 12276 bytes

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