Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c887164d6611a7…

MALICIOUS

PDF

74.9 KB Created: 2021-06-03 12:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c73abc23f6e35adbdd6eafc0541311f2 SHA-1: a8c0e2ded40221ce95bf49d287f2859c40811fc4 SHA-256: a0c887164d6611a7a637449fcf51cc95ffdeba221014bf21540e01cdbef37567
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly 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 0.9997

Heuristics 6

  • 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.
  • 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://golowaki.ru/123?utm_term=autostrade+italia+informazioni+traffico PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405930/normal_606b0c04c133c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450502/normal_60038f2ee0060.pdfIn PDF document text
    • https://zerevodajerut.weebly.com/uploads/1/3/4/5/134502997/3357699.pdfIn PDF document text
    • https://xijananok.weebly.com/uploads/1/3/0/7/130740199/48c3d038e6.pdfIn PDF document text
    • https://xiwotedusogatif.weebly.com/uploads/1/3/0/7/130775269/658344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465018/normal_6038e1c132bc3.pdfIn PDF document text
    • https://mojibivod.weebly.com/uploads/1/3/4/4/134490358/kekonizatizen_famulel_sabovamefuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379049/normal_5ffadc99e5b7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lagawiwefe.pbworks.com/w/file/fetch/144512418/tegeleran.pdfIn PDF document text
    • http://bamedun.pbworks.com/w/file/fetch/144458880/gexojalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95e3409d-7b09-4ba5-a1a5-6d912fda4dc2/jebawidaf.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144425265/dd_ship_map_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c2857d1-78bd-431a-ae75-76287a570add/geremobufasibifozodoruzox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/111a0b4b-204f-477b-9408-15330004b11f/rowenta_clothes_steamer_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/284a2d95-8263-4939-9b03-6010b894fb03/47961248086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f775d7a8-0bb7-405c-a827-1ec4ce842b83/95668805980.pdfIn PDF document text
    • http://damopijos.pbworks.com/f/zekoxaxaxuxavefuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f952a38-ce6e-4416-94b4-65d224318dbd/sql_server_2016_with_sp2_dvd_iso_image.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2af2858b-224f-4e28-bfe7-f91ae9c72503/tasolakogibubiw.pdfIn PDF document text
    • http://guronavageba.pbworks.com/w/file/fetch/144514623/dizisogugisajatevidapotef.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/w/file/fetch/144425886/sigma_bc_1609_sts_cadence_manual.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_off0000e3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 5204 bytes
SHA-256: ebb1c4e7af6c40deb6196b03f5fdb4df37c814a332e1de2023f7b2b5aec40387
font_01_sfnt_off0000f56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 11948 bytes
SHA-256: be0f18b60cbb413f754090801d1d5212bfcdb1ba94cd1efd6330900540a0ff25