Malicious PDF — malware analysis report

Static analysis result for SHA-256 c706b10d2e3a0b95…

MALICIOUS

PDF

76.2 KB Created: 2021-03-13 17:32:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c5dfc2ff45eef04bc2e4d290a567e75b SHA-1: 6e7212b20dbd0a54ff8ad5c73bcd8f55bc400218 SHA-256: c706b10d2e3a0b95c591501f2fc286cff08d5b99536084e454a6ac3877b868f7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The primary URL, https://maypoin.ru/strik, is likely part of this malicious infrastructure.

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://maypoin.ru/strik?utm_term=rinnai+gas+water+heater+specifications PDF link annotation
    • http://rikororasikenek.iblogger.org/zamivelukuferuruv.pdfIn PDF document text
    • http://gunudatur.22web.org/82620810637.pdfIn PDF document text
    • http://olivamebel.com/farutomow70dyv.pdfIn PDF document text
    • https://nobakavukip.weebly.com/uploads/1/3/4/3/134373074/8351295.pdfIn PDF document text
    • https://gexirirexov.weebly.com/uploads/1/3/0/8/130874239/7e060.pdfIn PDF document text
    • http://lighterusb24.site/rukoziwukawaka9b38.pdfIn PDF document text
    • http://icily.xyz/where_can_i_buy_beats_headphones_for_cheapfgqj5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vizawog.epizy.com/rocket_propulsion_derivation_class_11.pdfIn PDF document text
    • http://gosiparaxako.rf.gd/sivoxorifav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2717c1f0-c9df-40c5-943c-046f093ba3fe/graco_magnum_pro_x7_rebuild_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bffa2d2-1c1f-46ff-9c12-bc43836203ba/all_html_tags_and_uses.pdfIn PDF document text
    • http://fukefuxatolu.epizy.com/71041417069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4690872-dde8-4d03-93b8-12b32ab49486/painting_bathroom_cabinets_black.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a613b2e-55da-446e-a934-fb23ea476ec1/how_much_juice_does_a_can_of_frozen_concentrate_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2f10fc8-fdf0-4987-9589-a9c4e3b5f9fe/keketejozarifibogotiv.pdfIn PDF document text
    • http://govatojajij.epizy.com/33188172614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2306c3f-d847-453e-b3ee-38e9a0eb7e17/how_to_make_mortises_with_a_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4078e7a-be43-46b9-b886-8ca137fc5f26/ak_driver_license_record_nj.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_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 5344 bytes
SHA-256: 437fbc10423f74cabc40bc1f70f76d5f3e7bf09d808358e6799e741fe8aac9b4
font_01_sfnt_off0000fcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEE 11520 bytes
SHA-256: f05ff3120e56cb5211f22818a8c2effdb14579bc4e660d56cf9421e5a6a09095

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