Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60685513066418f…

MALICIOUS

PDF

74.9 KB Created: 2021-06-01 17:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 62967400567ae3ab78363a7b2debf571 SHA-1: d7efa58615db67bf7cb60f0e0ced5f25018403e4 SHA-256: a60685513066418f81f411f0e7d1e65ef77671b17cf69f11b5680039162c44b7
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 0.9996

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://mezovuduw.ru/123?utm_term=athabasca+course+extension+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403539/normal_605072d296f19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485161/normal_5fc5837847178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482215/normal_604ccf24b50d8.pdfIn PDF document text
    • https://nebelifufenav.weebly.com/uploads/1/3/1/4/131437331/2976247.pdfIn PDF document text
    • https://koborabi.weebly.com/uploads/1/3/0/7/130775888/a1f24.pdfIn PDF document text
    • https://wejatinolu.weebly.com/uploads/1/3/1/4/131438249/xefinanosaxivezatig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/924d9a47-59cc-4ffb-a7dc-74c89bc8edef/why_do_atoms_join_together_to_form_compounds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f6ec3db-7389-4f87-bcca-b0ed02b63153/fujojineri.pdfIn PDF document text
    • http://nikekuva.pbworks.com/f/dapamexibunuxokojabopu.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/w/file/fetch/144416484/13173010163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d62a6f0b-8802-4c48-bf50-30ea3c6783ec/53386709293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/353bc4e2-c23a-40b5-b6bc-28c31e12d579/20343873782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f20e1c1-2a12-4f12-af54-cdf84d48c1cf/what_legendaries_can_you_catch_in_pokemon_ultra_sun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a49085-b26f-417c-b762-68ad958abfc6/mipagiv.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/w/file/fetch/144457707/xamojasepowuzanawutuloze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34b4b564-7e57-4c4c-9942-bc2b85d74622/the_art_of_kissing_1936.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/f/af_sosyal_bilimlerde_aratrma_yntemleri_ders_notlar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/434b4c75-d9d3-4a49-ad41-b88c63c97ae7/ar_15_magazine_release_button_stuck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b99ca32-3f69-4d9a-8cc5-e103d3e7ca6f/54802182026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d3bcc7-ba06-4485-87fa-985da21b10be/kenmore_coldspot_side_by_side_refrigerator_water_filter_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff771b5-ddb3-4644-9e50-cceaa01eb4a1/vixaramazodirexina.pdfIn PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/144455103/how_to_manual_mtb_hardtail.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_off0000e6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CF 5284 bytes
SHA-256: 9016453df3e5b7f009debdf8195c7dc348e883f9eb7e9e542e06da2887ca8796
font_01_sfnt_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 11292 bytes
SHA-256: 53e99d3f11a11808e1c3e5afac15eefc62f265d71f8b5124ca3af3b52801f63a