Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b22c9a5c609c0f…

MALICIOUS

PDF

95.3 KB Created: 2021-03-25 03:39:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1062b3fb9b4adb34dec037f9f1b8b3c2 SHA-1: d7b6384ced95aa6fafc72285ce4cd021738594af SHA-256: b7b22c9a5c609c0fb09feae87f0510b859f5a759234eb4d36e189c99b74ba03a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as search results for popular topics, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/award?keyword=bsc+2nd+year+physics+books+pdf+free+download
    • https://cdn-cms.f-static.net/uploads/4401732/normal_605ba02d64fa4.pdf
    • https://cdn-cms.f-static.net/uploads/4379854/normal_6018496bba408.pdf
    • https://cdn-cms.f-static.net/uploads/4366630/normal_600cb15db52c8.pdf
    • https://cdn.sqhk.co/pivokazi/n11kigy/14429748002.pdf
    • https://cdn.sqhk.co/resozasevej/jUzggKW/hill_climb_racing_2_best_car_to_upgrade.pdf
    • http://bodyita.space/when_should_i_plant_tomatoes_in_texaskdtbu.pdf
    • http://bbflowers.net/windrock_trail_mapnm0vn.pdf
    • http://trastenmyqort.online/how_to_answer_teacher_interview_question_tell_me_about_yourself1gbko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/32442bf1-241d-476b-b4de-e94d85c8c8c7/41899200069.pdf
    • https://uploads.strikinglycdn.com/files/09b3e095-3d2d-46d4-a3c5-d7904a24d5fd/fonupisanojaf.pdf
    • https://uploads.strikinglycdn.com/files/0c009767-4fc7-404d-839b-8ee6804f221e/how_to_get_free_rp_league_of_legends_2020.pdf
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_d5bddf8328b3435590e6c3622df74cbd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4bde1591-460d-430b-a6a8-09e7b81c3c79/audio-technica_at-lp120-usb_turntable_-_black.pdf
    • https://uploads.strikinglycdn.com/files/f4e1c61f-3d18-4077-9812-68c18a479f47/icom_756_pro_ii_manual.pdf
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_4d89c94512eb4acb8beb830b0eefcbf1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/38e2b117-1ef2-4fbc-9db6-310a7f91a0dc/how_tall_is_manny_heffley.pdf
    • https://uploads.strikinglycdn.com/files/1f326377-c71f-4fff-a41d-ee2750e250ee/boss_dd-5_review.pdf
    • https://uploads.strikinglycdn.com/files/91025e8e-76e6-42fc-9b94-9b71825282c2/mainstays_slimline_digital_scale_accuracy.pdf
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_ed2bcf3724604d13a00d656c79ea340c.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109b5.bin
ebb3a2a054bcae138f2b393df7b2e5d522234c312f320e66055b335d33002129		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 5824 bytes
font_01_sfnt_off00011d98.bin
a0f5a8dfeaa0bb6dc0effbaf73f2996d6fa971a09dbb121d521afc971fdcd47e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 3204 bytes
font_02_sfnt_off00012a8b.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8B 1800 bytes
font_03_sfnt_off00013319.bin
9f715b758547b54ddbd4c1357c1be3b540e55a9eb3c333a4dea7b380a47d13e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13319 11168 bytes
font_04_sfnt_off0001595b.bin
5338b60dac2ddcc9fbf81734882903060897ff8c18563aad6864a581beec55c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1595B 16068 bytes

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