Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd0551c7359883f…

MALICIOUS

PDF

70.3 KB Created: 2021-02-21 16:46:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3911f7e25c89db0c5b348c6170dd0ba7 SHA-1: 962d76b753af57a3ced0d83c5b5895138aa8f31a SHA-256: acd0551c7359883f6820aac26c28281f6d48e7e4b59fff883505e24ef945536d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jacksth.ru/wix?keyword=can+baby+sugar+gliders+eat+pineapple PDF link annotation
    • http://fevuworejefe.iblogger.org/numbers_until_100_worksheets.pdfIn PDF document text
    • http://gitilapen.66ghz.com/40158616201.pdfIn PDF document text
    • https://wopurosifagup.weebly.com/uploads/1/3/5/3/135333772/tevenarofufom_tigetasakepo_kesus.pdfIn PDF document text
    • http://ramuwazezu.22web.org/photo_nature_hd_wallpaper.pdfIn PDF document text
    • https://malitorenifavo.weebly.com/uploads/1/3/4/0/134017021/7d3524714b8d.pdfIn PDF document text
    • https://vexalujonesudu.weebly.com/uploads/1/3/4/7/134738084/bc4206d9c51e48.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bodajaku/competitive_analysis_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/brother_mfc_7340_toner_cartridge.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/baskin_robbins_cake_nutrition_information.pdfIn PDF document text
    • http://pulawev.epizy.com/xotokapavetij.pdfIn PDF document text
    • http://ritarejameja.epizy.com/4674191870.pdfIn PDF document text
    • http://dosekidonara.epizy.com/medagidebe.pdfIn PDF document text
    • http://nasapatede.epizy.com/environmental_management_journal_author_guidelines.pdfIn PDF document text
    • http://tawegoju.rf.gd/what_is_the_3_times_table_up_to_100.pdfIn PDF document text
    • http://dijutago.rf.gd/28070931829.pdfIn 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_off0000d544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD544 5276 bytes
SHA-256: 9b4e159259418d8298147fedac7b9767507c0f4cc9bfc079f33d498184a056bc
font_01_sfnt_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 11024 bytes
SHA-256: cc9bf0f811b04a1bd87417396c8b22c70a87612634d1bba621b790a377fa65d2

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