Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d455fa86626c05…

MALICIOUS

PDF

73.3 KB Created: 2021-03-16 13:12:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ab23c3fd499e40a08aeb4d1278bf063 SHA-1: dbe22e054474d1860beae1ba25934bf04351e378 SHA-256: 95d455fa86626c05dca12ce016865c4f01c225e631329991466b01ccd970fbe9
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 point to PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/wix?keyword=westside+middle+school+academy+danbury+ct
    • http://ionatr.space/mbd_english_guide_for_class_8r8ius.pdf
    • https://cdn.sqhk.co/xiroxozalal/jjhaibJ/menu_domino_pizza_2020_indonesia.pdf
    • https://togodinaxudare.weebly.com/uploads/1/3/1/6/131637070/ded1c049888c.pdf
    • https://cdn.sqhk.co/kubizevomedi/hidNSV0/asturiana_de_falla.pdf
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/liwemazebitezo-vajel.pdf
    • http://scm03.ru/noravamigasutafoxuwogodogr28vu.pdf
    • https://cdn.sqhk.co/rufosopufu/I9dhfgd/alien_shooter_gift_codes_ios.pdf
    • https://vademakab.weebly.com/uploads/1/3/1/3/131380849/tutixezarewus_wafekug.pdf
    • https://cdn.sqhk.co/wifopuzuxiba/52iiGhi/witcher_crafting_armor.pdf
    • https://zevakevo.weebly.com/uploads/1/3/5/4/135400716/kunufazujoku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bezegoluzose/natezeremovirosorexura.pdf
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_0954a18270a849798073b463067dd96c.pdf?index=true
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_d20b421893eb4ef88fa9bc92dd0afec0.pdf?index=true
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_a28a592e1c124431a0114e1e198a4cc8.pdf?index=true
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_dc0e90d7fbb3403fa1b69916e79f01fc.pdf?index=true
    • https://s3.amazonaws.com/kakef/9624502365.pdf
    • https://s3.amazonaws.com/remufuzu/tudawak.pdf
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_983a0c912893415db74c2861b55d37e7.pdf?index=true
    • https://s3.amazonaws.com/rujabepifar/kalesizevibokejoxinituz.pdf
    • https://s3.amazonaws.com/salade/zowamebelukizute.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000decb.bin
e3981a3565ee85af9ff645ca9c989a12cd30fcbb50ffc5306de95e9afe1fc339		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDECB 5436 bytes
font_01_sfnt_off0000f122.bin
de26e4b0761579352c5a80b2334c158d9c2362a4d3a7446760c6c0c003a62ee7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 11372 bytes

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