Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46e6eb4961f3978…

MALICIOUS

PDF

89.3 KB Created: 2021-04-02 18:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bf935ef3ebe553447f034307536ce4aa SHA-1: 583249ebf929aea1cc0b00eb5b6d9c4d226b98c1 SHA-256: d46e6eb4961f39786319660d5a301861f0747ef0cea35745ca16965318ed1cf8
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://resalured.ru/strik?utm_term=compare+contax+g1+and+g2 PDF link annotation
    • http://fortuneo-enligne.com/wibopusurryls0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390383/normal_606723c037266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_6056447beb97f.pdfIn PDF document text
    • http://infokurs.design/87457134441wc08n.pdfIn PDF document text
    • https://dipafasimabake.weebly.com/uploads/1/3/1/1/131164320/dujiwimujubum_mifulojememoji_gaxoberezepa.pdfIn PDF document text
    • http://instapresent.site/905117470038t2a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485807/normal_602039941b2f3.pdfIn PDF document text
    • http://bettermoneytips.com/davifexuwamixekulakewalaicz5j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381108/normal_6048c524bda1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461763/normal_605d9aa7333fd.pdfIn PDF document text
    • https://wegotogad.weebly.com/uploads/1/3/4/3/134342574/rurodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410953/normal_605246b26786a.pdfIn PDF document text
    • http://dom-bita.org/newizaduriivvc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414336/normal_5ff76154c44f3.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/6a696195-41f1-4beb-9e7e-744b363c5277/59444928216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ef061e2-0ff4-499e-a641-676d7f2b6912/8746770128.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/32205212503.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/xizekukexulotefebos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b93baf7b-23ac-4bc8-8757-cc34fa087c24/the_magic_tree_house_books_author.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/fridge_temperature_sheets_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/how_to_fill_up_kiinde_bottle_warmer.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_off00011e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E29 5340 bytes
SHA-256: 245353699ae7da8fbbd02e740b9fe787f46d0ac5278aa38d8f704f17340452ab
font_01_sfnt_off00013040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13040 11580 bytes
SHA-256: fab30ea69d73ea0249bd5a2612471cd6dd0c960e470b6b8e1b4b182e1ac1d1d8