Malicious PDF — malware analysis report

Static analysis result for SHA-256 1707ad72ef971d8a…

MALICIOUS

PDF

83.0 KB Created: 2021-04-07 13:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 090c35d935247a6ef7dae843ebc6f9d0 SHA-1: 68e339e7cb0412862dd637b64e52c5f48c1efe7b SHA-256: 1707ad72ef971d8a7c816c20d55f7d35d86471260a0aa6c76d15548abbf136ff
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. This is supported by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs suggest a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cdn-cms.f-static.net/uploads/4412379/normal_60116e34f0b97.pdf In PDF document text
    • http://registrat.space/celulas_caliciformes_intestino_gruesoj4gda.pdfIn PDF document text
    • http://clobuss.ru/17352258090un9sf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455196/normal_5fc6d8c1cad8b.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/buduzuzhbqlc.pdfIn PDF document text
    • http://dlkmvkoenv.info/75939698899mndme.pdfIn PDF document text
    • http://zereteleriw.getenjoyment.net/68695242211.pdfIn PDF document text
    • http://telgrm.site/accutire_ms-4021b_digital_tire_pressure_gauge_reviewb4x3c.pdfIn PDF document text
    • http://xaredazisom.mywebcommunity.org/arithmetic_progression_chapter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_e4599ba76c5844798ff17fd80c1ebd57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/selami.pdfIn PDF document text
    • https://a49ec80b-b4e3-4dac-84ed-d687b6aff6a5.filesusr.com/ugd/46d696_105baa3f3a1d41c8a5705f4644b31341.pdf?index=trueIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/reading_for_gist_activities.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/1689_london_baptist_confession_of_faith_modern_english.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/what_is_man_in_contemporary_philosophy.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_fa0a237c5ba641b5b58d4a5d4fd727e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zikeko/front_bumper_fire_hose_loads.pdfIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_667e6724043f4c45812b8af9b8236895.pdf?index=trueIn PDF document text
    • https://69b12d55-863e-458e-a545-ad358ed6bd1a.filesusr.com/ugd/a9642c_40f964637f944d09b4b0488e7058243b.pdf?index=trueIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_cc85829921d9460b89c23fb350c994fe.pdf?index=trueIn PDF document text
    • https://b993c520-4fc9-488d-8dda-35d8b3dc2713.filesusr.com/ugd/6f5492_1dbf7c1ec46e4e6ba84630de00525309.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/nalokumetopebekezikafusu.pdfIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_0122a7ef3a714d2483aae951e7c07b85.pdf?index=trueIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/bQ3nTxENlgE/wb?keyword=how%20to%20do%20PDF link annotation
    • 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 4868 bytes
SHA-256: 8cc2cd11afd791cc96be6671feb93c7173f965a134da44a27fa5adaec64aaf2e
font_01_sfnt_off0000ff80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF80 11532 bytes
SHA-256: 2fab4ef16e5693ad550a2d42876ff23bc4d796edcb34f30c5a822f4238e7e78d
font_02_sfnt_off00012780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12780 16220 bytes
SHA-256: 999a0be71d20206da3850ee9bf0cbe7a602f5a2fdddcbdadcd2b0823405ea535

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