Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8335cc14aea96a…

MALICIOUS

PDF

81.2 KB Created: 2021-01-30 04:50:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7328d7a59ab4e6de1e158a97e0a7e363 SHA-1: fedc02a3424103ee091514d02d303e3ce6ef4b81 SHA-256: 8b8335cc14aea96ae71e7940da04fb0436297235a2e82dc0d6c13c5d4cc81004
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains or link farms, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used for phishing or distributing further malware. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' confirm the link-farming behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/aws?utm_term=candy+crush+for+macbook+pro+free PDF link annotation
    • https://ruwawakutiro.weebly.com/uploads/1/3/0/8/130874672/kutowodogak.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwezomu/ggJhfje/hyperspin_pc_games_pack.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/bojd8NG/2395243298.pdfIn PDF document text
    • http://rm-swis-mine.com/printable_2nd_grade_math_placement_testdxnyl.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/iyggwid/happier_lyrics_karaoke_piano.pdfIn PDF document text
    • http://fastgetme.online/77910751344sbmbt.pdfIn PDF document text
    • https://wubigunes.weebly.com/uploads/1/3/4/5/134507070/vofulimefarilir_naliruva.pdfIn PDF document text
    • https://cdn.sqhk.co/kasavakujosi/ejdxgiS/biwuvuvavadoratofi.pdfIn PDF document text
    • https://cdn.sqhk.co/xejexeremiso/ifWHgjd/elemental_dungeon_mod_apk_no_root.pdfIn PDF document text
    • https://vaxunupix.weebly.com/uploads/1/3/0/7/130775436/galok.pdfIn PDF document text
    • http://armada.technology/simple_past_tense_grammarlie5w.pdfIn PDF document text
    • http://galoomer.online/ninja_assassin_warrior_legendary_super_hero_surprise69dti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/neviwove/wefogikozu.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/ropenowomir.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/3d_special_effect_photo_editor_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 5572 bytes
SHA-256: 87a5e8c933855b75c1d3f48f984844b9ecad5ac730c8dd0534ac01a699f6fa5a
font_01_sfnt_off0000fe13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE13 10412 bytes
SHA-256: 22e32d05faf434e39b728ea8637b794de858d56a81ad068be5d5f847308fdad1
font_02_sfnt_off000121d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D1 16344 bytes
SHA-256: ed45a24507f18daeaf6b6e9cac20235e9e43bed88bc2d44b7621eff085e31190

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