Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f13f21feaf5f8f3…

MALICIOUS

PDF

80.3 KB Created: 2021-03-04 00:08:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f1c3a6c0874db2ccff2365fcef4063d7 SHA-1: 7649b29325430637d8375f5290466ef5e38f58b0 SHA-256: 6f13f21feaf5f8f311b7d4c321c9f2af9b3e17fc920cea89ec0f7ab108619b63
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing campaign. The presence of an embedded URL and the 'Urgency / deadline lure' heuristic further support a phishing or malware distribution attack pattern.

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=the+man+who+can%2527t+stop+hiccupping PDF link annotation
    • http://air-calm2.club/global_marketing4an6k.pdfIn PDF document text
    • http://idealica-italiaofficial.site/85384007203on8gr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495551/normal_5fcc6454f0385.pdfIn PDF document text
    • http://zefedupawomodos.22web.org/alicante_airport_departure_information.pdfIn PDF document text
    • http://allfreebets.ru/709045153211x2x7.pdfIn PDF document text
    • https://fuwelobuzade.weebly.com/uploads/1/3/4/6/134649994/3952297.pdfIn PDF document text
    • http://theraisins.pro/how_to_program_a_tork_457z_timerngipg.pdfIn PDF document text
    • https://lepuzabokagat.weebly.com/uploads/1/3/4/3/134333079/d40a7dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381318/normal_6027c0907390e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419832/normal_5fc8671bd31b6.pdfIn PDF document text
    • http://gerisekazaleg.22web.org/how_to_develop_your_cultural_competence.pdfIn PDF document text
    • http://prizinsta24.site/patterns_for_college_writing_14th_edition_ebookf1ivc.pdfIn PDF document text
    • http://bumaga.bz/53381204938fi1mo.pdfIn PDF document text
    • https://sesifubonimexa.weebly.com/uploads/1/3/5/3/135317238/4885579.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fokezazonof.epizy.com/putix.pdfIn PDF document text
    • http://badidadawuf.rf.gd/new_diary_of_a_wimpy_kid_2021.pdfIn PDF document text
    • http://filusexiwagip.epizy.com/48463935109.pdfIn PDF document text
    • http://xivobotaxonid.epizy.com/93029597556.pdfIn PDF document text
    • http://bewaxibazo.epizy.com/predator_generator_8750_watts.pdfIn PDF document text
    • http://kumapupuwaz.epizy.com/free_excel_test_template_for_interview.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_off0000feb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 5292 bytes
SHA-256: 099dccc7504a3d3c2c47d4cdcc905cc131fa0835df1411a3b9191905ad200ae2
font_01_sfnt_off000110ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AD 10356 bytes
SHA-256: 9b3aa5b2071adb38b5f272f801f7dfc3a2968651066d05d0d291a36e744cebcc

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