Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8fd193a88d27ec…

MALICIOUS

PDF

121.4 KB Created: 2021-02-19 04:03:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73878a24287142d66afe1d464ddcc761 SHA-1: 7c2db7a13924a658a56cd76b4443b49dda2e4b28 SHA-256: 8d8fd193a88d27ec577ef0aea6e2f3ed970cf46ffb5006904a47be12259ca41f
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, and one critical heuristic identified it as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'answer key' and '7th grade', suggesting a lure to trick users into clicking the malicious link. The presence of numerous PDF links and the ML classifier's high confidence score further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/wix?keyword=9.1+independent+practice+answer+key+7th+grade
    • https://cdn-cms.f-static.net/uploads/4471240/normal_602eb5f66188b.pdf
    • https://static.s123-cdn-static.com/uploads/4479904/normal_5ffc751c3a713.pdf
    • https://totovipuvo.weebly.com/uploads/1/3/2/7/132740708/9938279.pdf
    • https://cdn.sqhk.co/rabataxuvax/phgiagg/cool_games_to_play_on_computer.pdf
    • https://static.s123-cdn-static.com/uploads/4369932/normal_6004f54b5f7c8.pdf
    • https://nuguviroguzemek.weebly.com/uploads/1/3/1/0/131070089/5458412.pdf
    • https://cdn.sqhk.co/jusitufugaf/giyoPgf/suzefekolazag.pdf
    • https://static.s123-cdn-static.com/uploads/4486199/normal_5fe20186877a8.pdf
    • https://cdn.sqhk.co/kajutizikodu/xKhdjgC/download_real_steel_boxing_champions_mod_apk_data.pdf
    • https://cdn.sqhk.co/pefevepufi/Gihjbhg/optical_illusion_rug_bridge.pdf
    • https://cdn-cms.f-static.net/uploads/4410206/normal_602dca2cac7df.pdf
    • https://nusuwexob.weebly.com/uploads/1/3/4/3/134352417/15b87f117cdd2f.pdf
    • http://in-step.shop/vokixonegudevvo2eb.pdf
    • https://cdn.sqhk.co/dutudovajud/eibNid3/sims_4_cheats_xbox_one_get_famous.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bulujono/misipenokod.pdf
    • https://s3.amazonaws.com/mujesogi/wolunaginewuxe.pdf
    • https://s3.amazonaws.com/jolituzoji/coplanar_waveguide_with_ground.pdf
    • https://s3.amazonaws.com/xomudufe/27507056586.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001769f.bin
af6bfdeb9cb15ba67c2ab72f8e5f8aef9fed187cad12937d2f85cfeb1d779a2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1769F 5464 bytes
font_01_sfnt_off00018949.bin
faaa8be895d6472bf2916b07e063730b0422f1a4d2cba8fda451a145f4049a6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18949 13244 bytes
font_02_sfnt_off0001b496.bin
f3b752e25d2e3098dc5b351a512c5ca672d2b137fcb7ddb3f81b2384be51d5c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B496 16072 bytes
font_03_sfnt_off0001c934.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C934 4324 bytes

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