Malicious PDF — malware analysis report

Static analysis result for SHA-256 048eae79bdfc260e…

MALICIOUS

PDF

73.1 KB Created: 2021-03-18 17:01:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04ca59f83b7b9eca55747aec6dee4210 SHA-1: 6303e5f687ccf7b0aa6426c24afbfc7248bcbf8f SHA-256: 048eae79bdfc260ef7fd8ef54b70f9207fc3eac0825b001a1f2309c575021c77
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting and appear to be part of a link farm. This suggests a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/wix?keyword=google+sites+games+center PDF link annotation
    • http://juwaniwabi.medianewsonline.com/how_to_reset_a_kidde_smoke_and_carbon_monoxide_alarm.pdfIn PDF document text
    • https://tikobivit.weebly.com/uploads/1/3/1/3/131382680/633c6e952c.pdfIn PDF document text
    • https://posuzelivoj.weebly.com/uploads/1/3/4/8/134869480/6cf6e19dcf46.pdfIn PDF document text
    • http://dashcamtopbest.com/why_my_freezer_is_not_freezingyz6dn.pdfIn PDF document text
    • http://copyright-help-center.com/99151976003vsq2h.pdfIn PDF document text
    • http://nubilofanekib.mygamesonline.org/la_casa_de_bernarda_alba_acto_1_vocabulario.pdfIn PDF document text
    • https://sawatulaboror.weebly.com/uploads/1/3/2/7/132710797/7532647.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/motabawojurakem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suxudogakol.myartsonline.com/why_wont_my_garmin_watch_turn_on.pdfIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_f03097d130ea4d07b03061422aa0038e.pdf?index=trueIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_3153841808fb432ebb391e37b2f184b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebenok/replace_new_transfer_belt_samsung_c480fw.pdfIn PDF document text
    • https://2ad55d82-15d9-4995-b72c-f03dca93b5f4.filesusr.com/ugd/11b7eb_68dbfbf7eed048e38933471b7b93d664.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/sufidivobusudum.pdfIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_da6610175b8a4cb2841d53b3af884644.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_off0000de19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 5148 bytes
SHA-256: 63d64f55e008bcb52fdab45a41391cd949cae8bbd0900919a99e4bb3d77ee658
font_01_sfnt_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 11604 bytes
SHA-256: aea8f9faf5b99aa64b5464efdfc64d180a26d47c9e01cf7ba51a49483606122c

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