Malicious PDF — malware analysis report

Static analysis result for SHA-256 20339de1c7f100b8…

MALICIOUS

PDF

83.5 KB Created: 2021-03-09 21:09:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f0e4623ff47e3963971bbebbc81ee8e5 SHA-1: 3135217879f9163e135c6d3f3c916edd469c3348 SHA-256: 20339de1c7f100b84ee658332d1923fae54896577f48965bd5c5b2911bbf1a11
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 0.9998

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://xajibur.ru/strik?utm_term=canon+powershot+sx700+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420459/normal_5fd7ecc9ae1b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497368/normal_5fe455c301de6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_ccb45f2607d24fdd800b05a1038041b8.pdf?index=trueIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_360987a034974fb5bc37b8d6f2dbedbb.pdf?index=trueIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_41550ddbf5bf47c3933a5a0d65ec87fa.pdf?index=trueIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_1da3089cd32c495a9776918e755932c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setikizo/what_temperature_are_iron_settings.pdfIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_ee9742f81e314d5d9d809aa65c3e2153.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/meludav/i_swear_song_punjabi.pdfIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_bc7ff9613bc4466fa5dac8bcaf718f07.pdf?index=trueIn PDF document text
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_c5e338369fea42a3b788af55eb290d8d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/mridang_movie_480p.pdfIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_c83e4f65e19b418896af3be4d6e22ace.pdf?index=trueIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_f75a8728a6df4898b5775558fd08a4bc.pdf?index=trueIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_c89983a4af05400a8105864226c42498.pdf?index=trueIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_850011828b71405b92074a6ed49be759.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_010387fae2364e5c891329ecd3a45b90.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/964a4528-0fee-413b-81d7-fd4fea6b7c68/how_to_use_braun_digital_thermometer_with_age_precision.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f487b48-6178-4e66-b859-5bb83d173b6c/lg_dishwasher_3850dd3006e_door_gasket.pdfIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_ac2fcc494e494631a6d3edc33e5270e3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 2984 bytes
SHA-256: 8cead77e9fa9021b573789ff5668a9b9aff3a0d29e468f1cbe8851244abe2067
font_01_sfnt_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 5348 bytes
SHA-256: 3716add5eeabcf09e32719e292d955f03368aef611a0e083202734e46eb84c5d
font_02_sfnt_off00011748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11748 12656 bytes
SHA-256: 2660719800f56ddd29c245714963a929fb49de346073b70d8f1f8db36d2e0f99