Malicious PDF — malware analysis report

Static analysis result for SHA-256 16330a54ffc0425b…

MALICIOUS

PDF

82.4 KB Created: 2021-04-18 12:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cd22890e2336b8595c7ef3fe934b570c SHA-1: 7830f0197c2d87445464ff37a33811daba950b41 SHA-256: 16330a54ffc0425b33af2e127c00b32c9bde71be8990c452284cd35e7774b6a9
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. The 'SE_CLICKFIX' heuristic indicates the document employs social engineering by instructing the user to execute a command, likely to download and run a secondary payload. The embedded URLs suggest a link farm designed to redirect users, with one URL pointing to a potential command execution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://vilenefex.ru/strik?utm_term=pdf+preview+handler+for+vista+outlook+2007 PDF link annotation
    • https://cdn.sqhk.co/gegatuzikat/jfigQ2p/wotavajezosi.pdfIn PDF document text
    • https://cdn.sqhk.co/sidigodoga/fKRmRZy/tik_tok_viral_english_song_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/gi8gfig/living_sacrifice_meaning_in_hebrew.pdfIn PDF document text
    • http://tunizunifegitof.66ghz.com/81966252195.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/WSqocbz/basketball_champions_league_unblocked_games.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/sggHV42/red_ball_2_cool_math_games.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9f61dd91-ea7e-4edc-a837-c43fae5dccfb.filesusr.com/ugd/ed897c_a21268e1a43a4c30be2f27c0daaf8247.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91f4f350-29a3-4a5f-9eeb-9f84d921b6e0/46394832394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f96c38f-ff46-475a-9074-a24c650d4d6f/java_interview_questions_amazon.pdfIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_d9fb133c5aff4ecb98e5498b57dabbf6.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_1ced7df6c350400db2b5ac94f634d54c.pdf?index=trueIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_aade9169ac7b4c18839898e80327db2c.pdf?index=trueIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_e59b7b55c02b4f17b5e5ea9e9ad65d54.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/05cdd5ab-0ea3-4567-9d57-9762e02db239/jakibevawovimo.pdfIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_4f8fde710de746c1b378bc44f8e89272.pdf?index=trueIn PDF document text
    • http://nizarajizigutut.epizy.com/48225490059.pdfIn PDF document text
    • http://xobekorafoza.epizy.com/12781987386.pdfIn PDF document text
    • http://sivokag.epizy.com/very_sad_status_video_for_whatsapp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fc6a1e2-bf78-4672-b30e-68a2c2d8b573/structures_why_things_dont_fall_down_epub.pdfIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_018e016af6ab478c9661d92e68ee52d2.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001028d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028D 5700 bytes
SHA-256: 1a4cc27c9929015f8b19a45465f62938606e44b97f0d6459339afdd79a5dd362
font_01_sfnt_off0001160d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160D 11148 bytes
SHA-256: 2bcebaa7393d2337fbb74923865f893d743fd8b4ad6d716b64af3819ea281961

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