Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a91f933a90847cb…

MALICIOUS

PDF

76.8 KB Created: 2021-04-28 22:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 00b09a948c9d7c831f772c5a4f673b00 SHA-1: 346c5a4deca6ec4c55c7611b943de93cd865ea90 SHA-256: 6a91f933a90847cb38083384e30924e031ef3444c4bed457cb8d1b65ab52d835
184 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to drawing on a computer, likely a lure to disguise the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+make+a+drawing+on+computer In PDF document text
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/179f2c268b2.pdfIn PDF document text
    • https://voviteri.weebly.com/uploads/1/3/4/9/134904749/7521836.pdfIn PDF document text
    • http://makamar.online/bhojpuri_gana_dj_remix_mein0qets.pdfIn PDF document text
    • http://winoorama.fun/megezulujowefepetaz7gri7.pdfIn PDF document text
    • https://lifitexuga.weebly.com/uploads/1/3/4/3/134356919/gewesudiriwomofuvaj.pdfIn PDF document text
    • http://vizit.store/dikuxuletej4yg8j.pdfIn PDF document text
    • http://noksipals.online/secrets_of_mind_power_booktvs1q.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/facebook_password_recovery_pagevulrd.pdfIn PDF document text
    • http://hotloveme.online/ronco_ready_grill_cookbookpbekz.pdfIn PDF document text
    • http://sallehq.xyz/denidafy5egp.pdfIn PDF document text
    • http://compte-cmbretagne.best/81716844112vf4g4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/36bfd3f4-2227-4041-8195-7dc007de1ae4/31371852288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/366c43c3-7cbf-471b-a184-9a42fc783a09/2262475556.pdfIn PDF document text
    • http://pawekixezad.epizy.com/84984102779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/046d8707-1c48-4c92-9749-009f0388485d/24080251502.pdfIn PDF document text
    • http://fonimegalidoxu.epizy.com/annabelle_2_movie_hd.pdfIn PDF document text
    • http://fedasumenusum.rf.gd/kesitabowif.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/anticonformiste_definition_courte.pdfIn PDF document text
    • http://lanelezezon.rf.gd/51499485263.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/subarunet_audio_s.pdfIn PDF document text
    • http://gezexibubaju.rf.gd/vegan_food_pyramid_guide.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_off0000e347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 5184 bytes
SHA-256: 1ad3854c52317a6fca1fadfe74b1d6f4a611d32b3d73bf0d900500171afdf160
font_01_sfnt_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 10120 bytes
SHA-256: 20186e5e34f914a882ab125ac221ffd892b03ea6e5ae2fb09eaacdf6ffd31f19
font_02_sfnt_off000117a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3