Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b72ac0c87ab92a…

MALICIOUS

PDF

74.6 KB Created: 2021-03-22 22:29:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 54dc9998669f621413104deb6a63ac43 SHA-1: b18b5865f75893e2d23425067a3eef09dedce690 SHA-256: 54b72ac0c87ab92a0e4e8d25ad5fa03f65871c3058b2a0616fa43e79745f9235
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/wix?keyword=angry+trumpet+guy+meme PDF link annotation
    • https://gijagexerifaru.weebly.com/uploads/1/3/5/3/135322880/56b60fa8bc5ef70.pdfIn PDF document text
    • https://malavaxun.weebly.com/uploads/1/3/4/0/134018228/784545.pdfIn PDF document text
    • http://gisomog.iblogger.org/3008679991.pdfIn PDF document text
    • http://notdull-eng.online/9242605917upy36.pdfIn PDF document text
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/dasibokus.pdfIn PDF document text
    • https://figeneluniw.weebly.com/uploads/1/3/4/8/134857588/4050063.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/79217453721.pdfIn PDF document text
    • http://vamefegali.mywebcommunity.org/body_parts_for_grade_1.pdfIn PDF document text
    • http://faceit.su/chamberlain_whisper_garage_door_opener_manualpqnyw.pdfIn PDF document text
    • http://organic100.fun/223171565059be1t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6724980-cad1-4ce0-a928-fc01ff0d0a63/the_magic_school_bus_rides_again_in_the_zone_123movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c43bc6a0-499c-43cd-9d83-7d41278171ba/12922576997.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c960719e-31db-457e-954e-9f49778a0390/how_to_change_the_battery_on_a_shoprider_scooter.pdfIn PDF document text
    • http://subokud.epizy.com/mandarin_thank_you_crossword_puzzle_clue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e387e84b-82b2-4883-81cf-0ca9a48cbfd8/34090153032.pdfIn PDF document text
    • http://molujafit.atwebpages.com/85105220663.pdfIn PDF document text
    • http://doxanagudaseku.epizy.com/pibiwoxaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a78547bf-a795-475e-8085-6bf013ba0c74/gabupanetanezam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04b71a44-fc57-4ac2-9d8f-06b5b0fe3e3d/medutumavozulanup.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A9 4808 bytes
SHA-256: 463a7ecedbe2372f0ae9a3dc6917086fe4ddf1b40ea5b6aee95bb420e45b25df
font_01_sfnt_off0000e9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 3120 bytes
SHA-256: 244b0377f03ce30c145c80f4c9bd1ba8ed40339857e3dcf5365c1a8b91472308
font_02_sfnt_off0000f6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AF 11244 bytes
SHA-256: c603cae735446df2f6511ef31147cd0345547b370222519c22ca07955634de10

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