Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4a9d173998a016…

MALICIOUS

PDF

94.8 KB Created: 2021-04-06 14:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9a72583909c0651c3fca1f91266492f SHA-1: 53055513b9af01084d09dd6aa3a537734714b25b SHA-256: 9b4a9d173998a0168a9ef87c55e8699ba78bb7cfffea99888e2f24730b93654c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a suspicious domain that is likely used for phishing or malware delivery. ClamAV detection and ML classification strongly indicate malicious intent. The presence of embedded links and the overall structure suggest this PDF is part of a phishing campaign, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=vitamix+a3500+review
    • https://dupevolorimix.weebly.com/uploads/1/3/4/5/134588768/3d5424c.pdf
    • http://vejaginupivedez.iblogger.org/3812560803.pdf
    • https://kesizibewasi.weebly.com/uploads/1/3/0/8/130813921/saraxusetizo.pdf
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/rasileduliv-rarubirusuzup-sunulesejok.pdf
    • https://bopelesi.weebly.com/uploads/1/3/0/8/130874615/8745324.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gurupixabogivaz/library_planner_template.pdf
    • https://s3.amazonaws.com/kubafezin/does_netflix_have_jack_reacher.pdf
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_d40918da74b74a5aa5d5f81169c2c6a3.pdf?index=true
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_6e0c15b522414e4b8ff54fadbd50e93c.pdf?index=true
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_2b2af65a0d054dcb803754ebcfca9f0d.pdf?index=true
    • https://s3.amazonaws.com/salade/sivokevalajapoxalorowo.pdf
    • https://s3.amazonaws.com/feseni/dizasizalopu.pdf
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_6e7bed551b4c470c88d03110774f2b03.pdf?index=true
    • https://e2a12503-e9f4-4898-9b1e-00959bf5a9c8.filesusr.com/ugd/1f0de7_6406cdfd115b4c3ea0b99026a964c665.pdf?index=true
    • http://ralenosozizog.epizy.com/lawunurikamunakobomidi.pdf
    • http://fugovolit.rf.gd/bigusifebelaxejazas.pdf
    • https://s3.amazonaws.com/pegozegi/rosetta_stone_spanish_worksheets.pdf
    • https://4f640d82-8365-4c22-93d6-dbd3427c3fb0.filesusr.com/ugd/55e8b7_8b5a6b1bf6b94e4d86327a780d2ad3ce.pdf?index=true
    • https://s3.amazonaws.com/vufupu/hays_australia_salary_guide_2019.pdf
    • https://s3.amazonaws.com/wupiwupiwot/android_floating_action_button_position.pdf
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_90001cac0b83493684b75d52ff2dbe4a.pdf?index=true
    • https://s3.amazonaws.com/vunizi/chronology_of_king_davids_life.pdf
    • https://s3.amazonaws.com/penale/bifug.pdf
    • https://s3.amazonaws.com/ziwuvijevo/blues_march_benny_golson_sheet_music.pdf
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_5c5205f34c244253a653aec9039d1af7.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d78.bin
5283103f98137967c9003c52fe4069b3d2486c7a81841b5eaf2ee8383747e6e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D78 5236 bytes
font_01_sfnt_off00012f4e.bin
f77c6f9d65bdf98ec92adb5bf45f665e4f874ecb69359f7dcfb48733147b527f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4E 11636 bytes
font_02_sfnt_off00015741.bin
ee796b0d072c3da784915329e3d40b60a5f3ef2e5e1937d62fc4d7a384cee729		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15741 16092 bytes

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