Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d657e62f498434…

MALICIOUS

PDF

88.7 KB Created: 2021-04-27 11:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1bb89204cac95e3669ed9a1e814211aa SHA-1: 97c050aa597db3a33c034b7db08bcdd2e53e2cfa SHA-256: d8d657e62f498434ac7f74adff45168d92c24d0c9856d52ca7aef311c4a1876b
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 0.9994

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://midufefew.ru/strik?utm_term=high+school+biology+textbooks+pdf PDF link annotation
    • http://marifivelaj.mygamesonline.org/tawhid_of_allah_s_most_beautiful_names_and_lofty_attributes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387218/normal_5fc9b5aedc193.pdfIn PDF document text
    • https://viwifigejemi.weebly.com/uploads/1/3/0/8/130814408/9901460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506063/normal_6023f198c65c1.pdfIn PDF document text
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/0359143b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477629/normal_60362d091a1cb.pdfIn PDF document text
    • https://xoluvaxabezil.weebly.com/uploads/1/3/4/3/134338990/latofiti.pdfIn PDF document text
    • https://tejojobowadame.weebly.com/uploads/1/3/0/8/130874570/1020287.pdfIn PDF document text
    • https://jiduwaramusova.weebly.com/uploads/1/3/4/8/134854614/mozolig-sukafi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421764/normal_5fc969c229e80.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/29ad7b22989.pdfIn PDF document text
    • https://dalideno.weebly.com/uploads/1/3/5/3/135384103/guteramevexa-nuxuz-xomifulibasonuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464539/normal_5fd6c705d155f.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/fawelokijaluw_nibozu_sadekimoji_wigirakobiwefe.pdfIn PDF document text
    • http://fajamad.mypressonline.com/5708094037.pdfIn PDF document text
    • https://bunekapizo.weebly.com/uploads/1/3/0/9/130969144/kazajax-zefejidiw-ridaralabo-nejezozenazar.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/63adba0c-822f-4fda-b6ee-da71d0e3ba4e/40986034659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0393c525-aa4c-4ef8-9de7-7c037aed4e9b/are_hybrid_vehicles_expensive_to_maintain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/349ce266-7c15-4420-87a4-14b44da64cec/what_is_difference_between_binomial_series_and_binomial_theorem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93351550-747c-48b8-8687-82a1b6c91819/2017390496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51e4f979-1f53-459d-a743-0be8ee20ccd2/craftsman_lt2000_service_manual.pdfIn PDF document text
    • http://karokifewugasuz.onlinewebshop.net/pisufisomeweruzaladuzuga.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E1 5448 bytes
SHA-256: fb60442c24cdeb8f25c6352cef3a50264478f84a2351b80a8673c7b7872fb766
font_01_sfnt_off0001157a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157A 12296 bytes
SHA-256: 6c303a9a4dab19080bf8d5db001fb4e8ea2228e46e1b32844839f40203bd3997
font_02_sfnt_off00013f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F71 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660