Malicious PDF — malware analysis report

Static analysis result for SHA-256 d775a0d395092e10…

MALICIOUS

PDF

94.7 KB Created: 2021-04-06 12:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ed3f6769067e20b64ce52698fee96e27 SHA-1: 460b70d287e93af5eab0854dbb23217ffd31ae9f SHA-256: d775a0d395092e109752b6a0efb6d6bffad8ad2187c54b73bb58505f11a78316
156 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 5

  • 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.
  • 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://dafemum.ru/strik?utm_term=french+verbs+conjugation+app PDF link annotation
    • https://cdn.sqhk.co/vakolitakap/gh3Sqf8/4x4_off_road_trucks_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/podoxato/iiidIjj/jasijiduvajimar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_605ca2b24da89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426953/normal_6029f1cadbd2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_5fdc1112ee7c7.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewakuw/tcgjial/disney_duets_karaoke_with_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/negolura/dZihggt/jajidutewanaxin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_60332ef3f1c0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445321/normal_5fc8b101a017d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_f491930cc1da4ba68add5404be7f2177.pdf?index=trueIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_558d8fac7a854b08a16c58e467b0cc92.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mujesogi/eric_foner_give_me_liberty_chapter_15_notes.pdfIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_7bfdab0d2c6b4adc977cc70e24dea8a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/safago/why_is_my_ezgo_charger_flashing_red.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/brain_mri_images.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/line_rangers_pvp_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/nufuzezizow.pdfIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_415818d507fb42e0b704d815a6475329.pdf?index=trueIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_10e35cc1ae424e0c8064bc66cb3a1099.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/50266326376.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/what_is_a_good_classroom_management_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/xezunafizisobenusu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C57 3312 bytes
SHA-256: a14950173e5d1d1f1c70576ac3dafa31bb0aa6ece26b8d12516862096ecff79f
font_01_sfnt_off00011838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11838 5396 bytes
SHA-256: 5e09a4fcfb1561562e889ee940f0fa6d9a43f395e24a6535faef811c16985319
font_02_sfnt_off00012a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9B 13012 bytes
SHA-256: 806f6eb111d3b7638e916ab5cfb358379a7cff7b0cbe1e1d6a9c9356dd98e530
font_03_sfnt_off00015513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15513 16684 bytes
SHA-256: d2dbedc23249eed12779007d0c58b566766b7d8fb5b0bb1d603b2aa598fde09e