Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cf465fea3f722f…

MALICIOUS

PDF

78.0 KB Created: 2021-05-12 05:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 917b28e547b1b937ebd4afd0f7fa8597 SHA-1: 1d367ea1e6e131192d6a542f7e5c0dc99f860672 SHA-256: b1cf465fea3f722f6f24ff909dc05729809996e040fe2ebd1f6dd84995998eca
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Qualification for rpsc 2nd grade teacher', likely intended to trick users into clicking the embedded URLs. The presence of embedded JavaScript, though not directly analyzed for specific actions, is a common vector for malicious PDF execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=qualification+for+rpsc+2nd+grade+teacher
    • https://cdn-cms.f-static.net/uploads/4377905/normal_605f706a9797e.pdf
    • https://static.s123-cdn-static.com/uploads/4366004/normal_5fe0592f138fc.pdf
    • https://cdn.sqhk.co/melipetoluf/COiilhd/46501956732.pdf
    • https://cdn-cms.f-static.net/uploads/4391907/normal_60416067a7a24.pdf
    • https://cdn-cms.f-static.net/uploads/4387218/normal_5fe7ca58f3e18.pdf
    • https://cdn-cms.f-static.net/uploads/4419633/normal_604eba3a30b49.pdf
    • https://cdn-cms.f-static.net/uploads/4424683/normal_5fd6753404939.pdf
    • https://cdn.sqhk.co/gizolaxufo/FjfnChh/tulerapuvujenub.pdf
    • https://cdn.sqhk.co/tixuniwe/aSN6BAC/air_hockey_soccer_tournament_bracket.pdf
    • https://cdn.sqhk.co/vuzefegevo/TV6igso/tubixaloloxuxo.pdf
    • https://cdn-cms.f-static.net/uploads/4450514/normal_5fe6b90412569.pdf
    • https://cdn-cms.f-static.net/uploads/4485930/normal_6015993548618.pdf
    • https://cdn-cms.f-static.net/uploads/4493545/normal_60164415b18b1.pdf
    • https://cdn-cms.f-static.net/uploads/4481684/normal_6048c8d055843.pdf
    • https://cdn.sqhk.co/janonaset/pdieVQ6/somaxivezodogukexiz.pdf
    • https://cdn.sqhk.co/saturarad/j80ohdM/bitlife_life_simulator_play_online.pdf
    • https://cdn-cms.f-static.net/uploads/4384647/normal_604ecd1f9605f.pdf
    • https://cdn.sqhk.co/fuludasowipu/hiNf2hj/retro_dangerous_dave_free_arcade_games.pdf
    • https://static.s123-cdn-static.com/uploads/4450864/normal_5ff5a5206a667.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_58ea08e7d24b4e518332486ae451dd90.pdf?index=true
    • https://b7b9a0d4-d71d-433a-9dbc-8293b1c729aa.filesusr.com/ugd/979434_0e9253b5a10c4876a91557bbdcaba5aa.pdf?index=true
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_3d7572df01d748c3b34fc60e310fffbb.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e528.bin
60c61e7ebe6e879166c8b0d444b9f85f198a5bf4eaf74b2f3acd015af3d7e4d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 5492 bytes
font_01_sfnt_off0000f7c7.bin
9fcbf74c2fe3a31f81777f1172fe5c8f09d2678a002377a3edbca2e31dbc3858		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 10652 bytes
font_02_sfnt_off00011c2c.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2C 4324 bytes

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