Malicious PDF — malware analysis report

Static analysis result for SHA-256 065a3d7f3d035385…

MALICIOUS

PDF

76.8 KB Created: 2021-04-11 17:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7eed81adf5c5a1cd9f4064e037fc0793 SHA-1: 1104931b34fd6764b2a22576f5626785fc4113d8 SHA-256: 065a3d7f3d0353850090da640ee4373793af144be326ff85af3e29d3bff2723f
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://baarspo.ru/strik?utm_term=my+struggle+karl+ove+knausgaard+quotes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5fd7c408f4219.pdfIn PDF document text
    • https://kewidanuratug.weebly.com/uploads/1/3/5/3/135323433/videnamonu-tarizewupofa.pdfIn PDF document text
    • https://vedirivokezijil.weebly.com/uploads/1/3/4/1/134108565/goluvip.pdfIn PDF document text
    • https://zupevojug.weebly.com/uploads/1/3/0/7/130740492/4592185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471488/normal_5fdc8747e23c4.pdfIn PDF document text
    • http://pifofobexaxel.mypressonline.com/forms_and_functions_of_nouns.pdfIn PDF document text
    • http://tadosuzewamu.medianewsonline.com/dyson_v11_absolute_cordless_vacuum_cleaner_manual.pdfIn PDF document text
    • https://jojurofi.weebly.com/uploads/1/3/4/6/134666092/335451.pdfIn PDF document text
    • http://venolilixe.mygamesonline.org/92940645512.pdfIn PDF document text
    • https://reponobokuwe.weebly.com/uploads/1/3/5/4/135401207/lelobabuvazofune.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/ableton_live_para_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22bb7d35-cb29-45d5-932a-9e78dbe357fb/bukumojuwuwajupexovosoko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9276cdc9-3213-446d-99f8-6384f6939b92/bivofofezojesodujara.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/nicomachean_ethics_book_2_quotes.pdfIn PDF document text
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_d50b6ab20b8f4c239e805ae7b3311cc5.pdf?index=trueIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_6510743696d1463caec8f3e1c435c262.pdf?index=trueIn PDF document text
    • http://rabatelekovufar.myartsonline.com/fisher_paykel_cool_drawer_canada.pdfIn PDF document text
    • http://benamow.myartsonline.com/bakiverarozawabadula.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/13254801737.pdfIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_95396eca978b4e3e98b0c6c0d30dac63.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paropabaru/wesazasurewogigoz.pdfIn PDF document text
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_043ef960ff4b492eaa50703f130b32f4.pdf?index=trueIn 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_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 5352 bytes
SHA-256: a251c8bc543790c4b193c8a96f3d4e92600c25926687b5d6c79e4f9ea9f05cb9
font_01_sfnt_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 10992 bytes
SHA-256: d7211b72961c162ef6a878d7957950fa8b270e75e7e8c77f02a376c674b7cc5a