Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad607a947b7a91bf…

MALICIOUS

PDF

83.5 KB Created: 2021-03-28 18:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4c930d9734d74aa34c18b9f01b3b7f78 SHA-1: c302f0da0f91741e4a87ebaad7415dfa40c953e2 SHA-256: ad607a947b7a91bfe9005cedf08e52c277be8dc111703fe3e320bb4f6886d22f
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=what+is+the+purpose+of+3+branches+of+government PDF link annotation
    • http://familyit.info/faux_leather_sheets_for_bows_ukmmzez.pdfIn PDF document text
    • http://nesobaka7.xyz/ferdinand_de_saussure_biographyozi16.pdfIn PDF document text
    • http://prizinsta365.website/where_is_the_lint_filter_on_a_bosch_washing_machineml800.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/d155c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418365/normal_5fd39c336f530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470016/normal_6027a287d1add.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468814/normal_60231c119f065.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/wirenevilatorofika.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479715/normal_60270b94145da.pdfIn PDF document text
    • https://vilomaranetuxer.weebly.com/uploads/1/3/4/5/134502128/pakawifuje.pdfIn PDF document text
    • https://bimomudunaxa.weebly.com/uploads/1/3/4/7/134757379/dodupapuluvedevus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463532/normal_605bc78d2b50f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_60274dbd1b5b8.pdfIn PDF document text
    • http://brightshopbg.xyz/17218855928dqwk1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481053/normal_605f8a4c1c665.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/sikuva/bachelor_party_malayalam_movie_cinemavilla.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/do_you_capitalize_former_president.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/54702349503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e5494f1-fe86-495c-a364-a2ac4e8effef/crossfit_gym_wear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a527ebfb-1cec-4814-a551-79f99106986c/55316178688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/762de1f7-da67-48b6-94d4-5fb3f1e7ee9c/sawuwifebetunuvevodizit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/896505cf-56bb-4df1-a517-b65c98b57e35/fisher_price_sweet_snugapuppy_dreams_cradle_n_swing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ed9acf-add5-42a0-89c5-4786411f7376/honda_hrr2168vka_spark_plug.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_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 5776 bytes
SHA-256: c1c984de0d4083bc82785a4940cd7853835416355bd5c4db43c96a9efdb6436e
font_01_sfnt_off00011c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6C 10564 bytes
SHA-256: 50eb8cb9be2d31c73fb01cad88908ecc715dafd60a0b6944f336b441b2cb776e