Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab9dc97a9fb01b5…

MALICIOUS

PDF

81.2 KB Created: 2021-03-26 13:09:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e0b655793c215874054fd25f2da81f41 SHA-1: af0e9d4f571727134231f0f7edcbd15a7505363d SHA-256: 0ab9dc97a9fb01b5fd4f01a22eafeebd902e0ebb5f3de7039baae165d89f0bef
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 0.9990

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/123?utm_term=free+math+worksheets+point+slope+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375339/normal_603ec5d414158.pdfIn PDF document text
    • https://watoniworawi.weebly.com/uploads/1/3/4/8/134871767/kinizukurebumis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454665/normal_603169a7cac04.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/can_you_still_buy_a_wii_in_2020wmuaf.pdfIn PDF document text
    • http://moshon.space/mercury_9.9_hp_2_stroke_outboard_for_salezii05.pdfIn PDF document text
    • https://nimudizovif.weebly.com/uploads/1/3/4/4/134478886/66f00fcb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470960/normal_6033073892345.pdfIn PDF document text
    • http://sodaapp.club/tanazizilokoxirolesuzuwi9k5.pdfIn PDF document text
    • https://vajasefa.weebly.com/uploads/1/3/4/4/134490273/8e6d52cfe5131.pdfIn PDF document text
    • https://lefesime.weebly.com/uploads/1/3/4/8/134882546/a0776347f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416327/normal_6048f6b70d2d9.pdfIn PDF document text
    • http://migerov.xyz/pewakenusem4lr0q.pdfIn PDF document text
    • http://lavka-karamel.ru/8743319996t2ckq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530868/normal_603b11fdcd7a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_3dabdc009e154c14bec5de091e81a5ac.pdf?index=trueIn PDF document text
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_e96bad324be541d9969698ad3b96c9bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/cub_cadet_lt1050_snow_blade.pdfIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_42b24cec7fb342dc8dc33192a07f5e2a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/kimenafuwav.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_f7673bc9bd9e4b67b3cd2a36ff7aaa1f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/96140894841.pdfIn PDF document text
    • http://venewimo.rf.gd/apa_referencing_guide_chapter_in_book.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/zizomo.pdfIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_9ddb6d60d1974ec7b079fd4b321e81e5.pdf?index=trueIn PDF document text
    • http://wivufaw.epizy.com/vigixaxevirudilafuzek.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 5040 bytes
SHA-256: 496bba30a73d77a0d80744f7094c8d50b72cf8dace60c3303d365c00a0621764
font_01_sfnt_off000104fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FA 10524 bytes
SHA-256: 4b3c58a521ad594d672bd7c3377bf84878e9bf29d0b089210a3747dac816f7a1
font_02_sfnt_off000128f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F3 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3