Malicious PDF — malware analysis report

Static analysis result for SHA-256 c691dca802062d13…

MALICIOUS

PDF

163.0 KB Created: 2021-05-08 11:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c81ba90d474c974f042a4bbf8bb08bf2 SHA-1: 4009f49fbeaa21590fde55368b5d7600ce758b1d SHA-256: c691dca802062d131705e50a715dcc9f26fecaaf4de786f982eedbef302c6bcd
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a primary suspicious URL pointing to 'jacksth.ru', suggesting it's part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a screenplay, which is a common tactic to entice users to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/strik?utm_term=avengers+age+of+ultron+screenplay+pdf PDF link annotation
    • https://cdn.sqhk.co/dugabolisuma/jhjfAZe/88957914970.pdfIn PDF document text
    • http://extrameets.fun/how_much_oil_in_turkey_fryer1qojk.pdfIn PDF document text
    • http://discout.online/how_to_clean_a_jacuzzi_whirlpool_tubs3vxv.pdfIn PDF document text
    • http://kartaidatodemeleri.com/how_to_turn_on_speedlight_sb-700r85os.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/7904395251912fqr.pdfIn PDF document text
    • https://cdn.sqhk.co/finulepaf/egdeUij/29472181509.pdfIn PDF document text
    • https://cdn.sqhk.co/zixapegof/cia27Zd/hertzko_hands-_free_running_dog_leash.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/ehf5fge/bibupilubibajonop.pdfIn PDF document text
    • http://opensol.xyz/the_silence_of_the_lambs_2_mason_vergerkd647.pdfIn PDF document text
    • http://prizinsta24.online/lingua_latina_roma_aeternavm8pm.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/dbFhfjg/senuwekobaxonivivonufo.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/c5bf334b-6a08-4200-9383-5dc81d02e907/zawezufidoxodi.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_9f846f08c5c74efbb8b881a3fe0495dd.pdf?index=trueIn PDF document text
    • http://kitawijarital.epizy.com/all_command_prompt_tricks_and_hacks.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_cc8e0361034c4c199ba5c980219411ad.pdf?index=trueIn PDF document text
    • https://fb1cd387-549b-40f1-a5a4-67fd65d29bb3.filesusr.com/ugd/4200b4_41a3ebace7274c2c96a49030c05e9849.pdf?index=trueIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_2fcec26edf8e4cb58b4ef1bd444385aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/76f60ffb-e606-40b6-a974-46f3d3e6de30/duwawateva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8d9c4e2-f575-488e-a61e-2e35d8a85014/jerib.pdfIn PDF document text
    • http://foweroboxufafuv.epizy.com/98217463510.pdfIn PDF document text
    • http://jokiperone.epizy.com/latitude_e5450_specs_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d0440d7-f1ce-426a-bc12-32472e2e61b7/foviliwowerapepa.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_off00024366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24366 5472 bytes
SHA-256: 45c3b89696aab4f5e6e570ae9748a70b4b8b97924849ff968ddf608a7f1f72ac
font_01_sfnt_off0002562d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2562D 11772 bytes
SHA-256: 4f80bcaa89fe5710a62790a793c6fd2255f53d91eccd09faa51de3cbfb408ba0

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