Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c9e5208dcd9d6e…

MALICIOUS

PDF

83.2 KB Created: 2021-03-21 00:13:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cd9f9772bee0e44b99e1930334d9a67f SHA-1: 993000a547f4a29f13f97dba94a539030ad16fbf SHA-256: b6c9e5208dcd9d6e4bd461da87a00b5fa4c7279d0f8d2f76df1420b9dcefc9db
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 0.9997

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://jumiwimov.ru/wix?keyword=apk+amp+player PDF link annotation
    • http://bunezafax.22web.org/12978919707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369764/normal_605546b1bb4f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450034/normal_604309c3bc340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391037/normal_603717ee35722.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_0ce2e6cd06b54942b53cda330cfb3b93.pdf?index=trueIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_169a2ebfa549460ca011ba569458af50.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/latufenaw/84846897996.pdfIn PDF document text
    • https://78a3f932-2eca-4366-91b9-d52a2f3c5f58.filesusr.com/ugd/a586f9_3d30cb3c7522404c901098e5e50223e4.pdf?index=trueIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_34bd345744cc4a1f83ed18ba0f84fb22.pdf?index=trueIn PDF document text
    • http://wisigisovet.rf.gd/shankara_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/53987424481.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_cf92160fba084c72ab314a8c5b94e0f1.pdf?index=trueIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_cd1b3d8328b04c2ba68480b5fd19aff9.pdf?index=trueIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_53ab80b92b764c8193974d4df47610e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wozoxub/gosumerovominepawujar.pdfIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_980f8ab131c44a4e912677eefbad25ab.pdf?index=trueIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_f58735b555754099aed8433a955d3ff2.pdf?index=trueIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_4117bd42430b464ab19156b6211734d8.pdf?index=trueIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_709484f8899945debc0376a06cc10c80.pdf?index=trueIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_5afbd0beaeef485aa8e6262b89a105cd.pdf?index=trueIn PDF document text
    • https://29bb9f0a-cb36-4278-8b1c-05d86a2267e4.filesusr.com/ugd/25e746_20ab7d3ee276431dbc3b1b4a3d7793f6.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_off0000fb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 4940 bytes
SHA-256: 4de63905efa1edfce2e2660d7a09bf1017a732203efd78b87e56b03e978b8bf3
font_01_sfnt_off00010c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4F 22148 bytes
SHA-256: 663c818ec132634a4bad6f312a9e1b907f8fad468b65d8c3ed1cc39c8da4f3d9