Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f34a11eb63deef…

MALICIOUS

PDF

90.9 KB Created: 2021-04-14 17:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 747bd60e2f0551907f437629c3ec368c SHA-1: 522c92183b1101c3960f55ca199f535b70dee11a SHA-256: c9f34a11eb63deeffde1df379a5598d671e01b979f4fd18f125035e4c21ae107
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/strik?utm_term=asus+x205+boot+from+usb PDF link annotation
    • http://wutopezogegusi.getenjoyment.net/business_letterhead_template.pdfIn PDF document text
    • http://mandarin-fruit.space/baldi_s_basics_super_easy_modizkjq.pdfIn PDF document text
    • http://mowewuwopirot.iblogger.org/zukije.pdfIn PDF document text
    • http://1yamal.space/lyrics_five_nights_at_freddys_2_song_-_its_been_so_longp5d8e.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/biophilic_design_book.pdfIn PDF document text
    • http://basukoroj.22web.org/avg_offline_setup.pdfIn PDF document text
    • http://rivoduzajoki.iblogger.org/new_jersey_answer_to_complaint_form.pdfIn PDF document text
    • http://jejunobu.iblogger.org/ramovuvijodifa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c941d99d-b58b-4215-81ce-525e38db2b81.filesusr.com/ugd/2dc4cf_d607f54802c843bb87ea382151cca928.pdf?index=trueIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_b6f80830064a4993b82c8093575037a0.pdf?index=trueIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_4effd55fd7a745a1a1063e24cff17161.pdf?index=trueIn PDF document text
    • http://zezazemana.epizy.com/flatpak_user_guide.pdfIn PDF document text
    • https://ee6e56e8-c390-49d2-810b-d4defef8b9c1.filesusr.com/ugd/eda187_c366a0850de243e592c8232e6351c149.pdf?index=trueIn PDF document text
    • http://pusebirenox.myartsonline.com/adversus_haereses.pdfIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_1968cc83b16c4605a20eb5b7a81352b4.pdf?index=trueIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_ec1fe547a2204a76b39226bb0cc1ca0b.pdf?index=trueIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_29a7a585ad014926bad9187834771aa7.pdf?index=trueIn PDF document text
    • http://mukonedes.epizy.com/negifu.pdfIn PDF document text
    • http://komorubureg.rf.gd/povonubumuwotawibeniti.pdfIn PDF document text
    • https://aa0e52d0-3c12-4d86-bfd3-e3284f950a51.filesusr.com/ugd/eb1974_fe1bc457fb8f432da1c679d165e05776.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_off00011db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB5 5264 bytes
SHA-256: 5d0b4f8aa5416c56536e9872bf32c8631a594609bab208ecbc530ee5dc21add1
font_01_sfnt_off00012f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F98 14696 bytes
SHA-256: 8eb48fe1a0f2b9f0bfe9211e647252fd48c8b8eea4215ef845368804ce1df266

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