Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ff55488a85e523…

MALICIOUS

PDF

78.6 KB Created: 2021-05-15 04:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5d0272c48d76500ee194634bf6b3d3e8 SHA-1: b581362200416ca726bf84e6e19f6708491386ca SHA-256: 83ff55488a85e523d07aac52f3b1e73bcf5d0be6d19b6c3afe73909c6e0c5a8d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://botokaw.ru/strik?utm_term=what+does+the+word+kou+mean+in+chinese PDF link annotation
    • https://wolafufep.weebly.com/uploads/1/3/5/3/135305459/6150668.pdfIn PDF document text
    • https://cdn.sqhk.co/girolivudafo/4Wijuij/70448288435.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/7iee4gf/19757241138.pdfIn PDF document text
    • https://nagobajega.weebly.com/uploads/1/3/1/3/131380413/487031.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/cPij0cr/setesededonek.pdfIn PDF document text
    • https://sesifubonimexa.weebly.com/uploads/1/3/5/3/135317238/fe574.pdfIn PDF document text
    • http://hermidkovo.info/does_tessa_get_pregnant_in_after_2kh7wi.pdfIn PDF document text
    • http://cleanup-sale.site/607440536638s5rn.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/boiaChj/juzezulasiwotoxude.pdfIn PDF document text
    • http://fastgetme.online/8531094836hcmlp.pdfIn PDF document text
    • http://nuveclovet.xyz/40293629121s6kgd.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/jiixwTC/cookie_monster_om_nom_nom_mp3.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/xifabilejilab/woseximinusuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a7b317d-114b-4952-8a6c-d9752e31d9d1/rufoloxapakukasivojine.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/36149130262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f9d8775-3130-478b-bf81-858e31caca25/insinkerator_manual.pdfIn PDF document text
    • http://xolefodaw.epizy.com/57055521812.pdfIn PDF document text
    • http://niwuzowebod.epizy.com/bacterial_meningitis_guidelines_philippines.pdfIn PDF document text
    • http://xuvaduw.epizy.com/chemical_engineering_projects_for_b._tech_students.pdfIn PDF document text
    • http://sawozepanoludib.rf.gd/90899196139.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/what_is_state_responsibility_under_international_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c77fbade-311f-44f6-b790-14885f8461c7/xovufazol.pdfIn PDF document text
    • http://deseruti.rf.gd/lethal_autonomous_weapons_systems.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_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 5316 bytes
SHA-256: e81f29c42200253a1a267627a88fff2ba72c09964ea7f3d3e7b21bcaf4bd96be
font_01_sfnt_off00010890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 10876 bytes
SHA-256: cfc550137e114efbaa0ff21b71e6cc8365502165385cccbd4e7b9c8cbab06cb2

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