Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d85276019cc0b3…

MALICIOUS

PDF

90.8 KB Created: 2021-04-06 21:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c7ab3d850443763e40d5f42e23d9d194 SHA-1: 43d8449da99042cbff4f7f7d1136ea64c138ee95 SHA-256: a3d85276019cc0b3d0ae4cd3d5058185fe98e6d5452e36bce687906f2468be2c
234 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, and is flagged as a link farm. Heuristics indicate it's a payment redirection lure, suggesting the intent is to trick users into visiting malicious sites disguised as payment instructions. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jumiwimov.ru/award?keyword=taittiriya+aranyaka+telugu+pdf PDF link annotation
    • http://koxelovanalimu.getenjoyment.net/zowiwenuwofokuvu.pdfIn PDF document text
    • http://xagakojitogiva.getenjoyment.net/history_of_autoimmunity.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462727/normal_60176bc9ca5f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495065/normal_603ba6c35336e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383913/normal_6007d9173a94a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454967/normal_6026191155dd9.pdfIn PDF document text
    • http://rotiwopofeze.mywebcommunity.org/93647369971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424400/normal_601e29054c74a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426279/normal_606be154c70eb.pdfIn PDF document text
    • http://wasegulom.mygamesonline.org/dujuvevi.pdfIn PDF document text
    • http://mupifojoxur.medianewsonline.com/asrb_admit_card_2020_download.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/41558183220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469374/normal_600afb9764ae7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bc881323-2374-4635-a2b7-f126f9929bd8.filesusr.com/ugd/546a35_55efca7d076b4b7ab52617adda9a6272.pdf?index=trueIn PDF document text
    • http://repofifimi.epizy.com/anemia_minsa_2020.pdfIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_c5d7810234c543aa81168b0f03e09e49.pdf?index=trueIn PDF document text
    • https://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_f563f87a58bb48e9b2bb7c5ac397c7c3.pdf?index=trueIn PDF document text
    • http://wareguw.atwebpages.com/agricultural_engineering_study_material.pdfIn PDF document text
    • http://vavebidogorul.rf.gd/can_you_apply_for_a_job_at_lowes_online.pdfIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_eaebfea9bfce494a9dc15b881cf7e3ed.pdf?index=trueIn PDF document text
    • http://rulamiji.onlinewebshop.net/extraccion_de_bromelina.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_off00010ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC9 5144 bytes
SHA-256: 6202d0d8a5b458e0c083b022e38e9b1ad16d2d4499fae0ad1e8cf204f02bfd27
font_01_sfnt_off00011c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6F 12416 bytes
SHA-256: 3232df9f9a9112ea9f254f3ad272f0424af6ead89d19743fee2f57a9f557679c
font_02_sfnt_off000146a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A5 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15