Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3a05eeb7e33c76…

MALICIOUS

PDF

71.9 KB Created: 2021-03-01 18:39:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 820594211185e4f4eaa6779e65a8baab SHA-1: 7f6b7026ee2dbf6c67d6ed28c209378dac06f35b SHA-256: 6f3a05eeb7e33c76aea4e36c40d5067bee28e335d12f79d610b4ebde09f9887e
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or redirection scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate that the primary function is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/123?utm_term=is+vizio+a+smart+tv PDF link annotation
    • http://cherrypimp.online/909739455296cpr.pdfIn PDF document text
    • https://cdn.sqhk.co/xizemeginu/hfXWjij/microsoft_bookings_multiple_appointments.pdfIn PDF document text
    • http://blekrossi.ru/21731783381rjjkw.pdfIn PDF document text
    • http://jabewes.medianewsonline.com/how_do_you_write_measurable_goals_and_objectives.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/hagijjU/mitawerudozekexusigir.pdfIn PDF document text
    • https://jasudelile.weebly.com/uploads/1/3/4/0/134012727/36984b165f3.pdfIn PDF document text
    • http://cafe-cok.ru/4n1k_kitap_indirr79gl.pdfIn PDF document text
    • https://majivuwuwu.weebly.com/uploads/1/3/2/6/132683475/2371624.pdfIn PDF document text
    • https://jikujumek.weebly.com/uploads/1/3/5/3/135318263/zizojunu.pdfIn PDF document text
    • https://cdn.sqhk.co/buzomesil/jghfEaT/maryland_national_and_state_parks_in_oregon.pdfIn PDF document text
    • https://joripipebepif.weebly.com/uploads/1/3/4/1/134131856/pewifa.pdfIn PDF document text
    • http://dfwshootersupply.com/34115627475nkj5r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mepogevotu.epizy.com/64317231613.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/93717968931.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/free_lagu_armand_maulana_terluka.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/pamikozigoxu.pdfIn PDF document text
    • http://zobawukesilebaf.epizy.com/cricket_betting_pro_app.pdfIn PDF document text
    • http://xakizuwebinul.rf.gd/ravesunijekulajivuvifut.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_off0000dc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 4848 bytes
SHA-256: 384d7a9ae2ba0734e2a63ab949f039b4bb53b5bb31e062ff265cf0eda38c5716
font_01_sfnt_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 11132 bytes
SHA-256: 4d37326d1a01f21a0d5c0249435d66c2ce57411084162d68b2bc7040ae1bc3a6

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