Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef2210378577a41…

MALICIOUS

PDF

77.7 KB Created: 2021-03-30 20:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8090e2a3fa2dd5d24f1380ccae1e5c99 SHA-1: 656374222a373d834a813d0c3739065a334a938d SHA-256: 4ef2210378577a41d462cc9e7aa3f1d121bf2b0fb3364102daae47617e2e01cd
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common tactic for SEO link farms and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the PDF structure suggest it's designed to redirect users to malicious websites, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/wix?keyword=the+office+piano+sheet+music+with+letters
    • http://pekibimige.mygamesonline.org/how_to_convert_to_word_on_iphone_7.pdf
    • http://lebedugipul.mywebcommunity.org/present_and_past_tense_exercises_with_answers.pdf
    • https://cdn.sqhk.co/bikuloxisage/e43lUhb/glory_road_soundtrack_imdb.pdf
    • https://cdn.sqhk.co/gijimexuv/dhf3Ahd/55295345698.pdf
    • https://cdn.sqhk.co/kagitenoru/hh1ihHB/armor_blitz_mod_1._4._27_download.pdf
    • http://xozowilozoga.mywebcommunity.org/14426943514.pdf
    • https://static.s123-cdn-static.com/uploads/4409118/normal_6009587015c4f.pdf
    • http://defokozixeral.sportsontheweb.net/fujirexajumonur.pdf
    • https://cdn-cms.f-static.net/uploads/4417807/normal_60250b3b3d86e.pdf
    • https://cdn.sqhk.co/nigulavax/ajijema/beninca_pupilla_photocells_manual.pdf
    • https://cdn.sqhk.co/xamizine/TggXihO/caption_profile_picture_facebook_mobile.pdf
    • http://fegivate.medianewsonline.com/mifevono.pdf
    • https://static.s123-cdn-static.com/uploads/4371272/normal_5ffe0d73ca3b6.pdf
    • http://gudutisiluzew.mypressonline.com/benzimidazoles_synthesis.pdf
    • http://ruwufuwetoj.mygamesonline.org/fokanepixugopepif.pdf
    • http://mosomupusafebin.medianewsonline.com/76772989561.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_4a72fe19f73b4bbda9003bf2b3263783.pdf?index=true
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_2fa07181578648d9aa0f864c4d3d6770.pdf?index=true
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_4b6b6e451b154322bd25d0f349be8df0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/43b76d14-e803-42d9-af6a-d192ccd9477f/what_is_a_schwinn_airdyne_worth.pdf
    • https://uploads.strikinglycdn.com/files/c8a99b63-75c6-45e6-a265-8570ee001d04/97533221995.pdf
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_39c5d5b99f8449bfb3634e67a8bb49b8.pdf?index=true
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_264674b4f2a046d9aa200db405caa411.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f27a.bin
7751933db76ec634ecd24b52670ac8b2b774617a410852eae9c6def42b4eebf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 5296 bytes
font_01_sfnt_off00010469.bin
bf6d0cfbf5fdddb9566e02cf0f5e65f613eb88acb83022323dc16b872f19634b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10469 10704 bytes

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