Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f46921a8910d4b6…

MALICIOUS

PDF

91.0 KB Created: 2021-04-09 21:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1dc169d7f24e5215b95eb5fd22e02f97 SHA-1: 22b9a2446c13d9f61df53436458942a69c196849 SHA-256: 9f46921a8910d4b61646fe66f399e1db43b6ad5d85233232ec3b8638dc423814
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicative of a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=mtd+lawn+mowers+manuals+free PDF link annotation
    • https://bejitukinerebi.weebly.com/uploads/1/3/4/8/134890105/6658949.pdfIn PDF document text
    • https://dopilefuma.weebly.com/uploads/1/3/4/7/134733068/puzuvesini.pdfIn PDF document text
    • https://pagofere.weebly.com/uploads/1/3/1/3/131398194/1024892.pdfIn PDF document text
    • https://jogelobob.weebly.com/uploads/1/3/5/9/135961552/gutus.pdfIn PDF document text
    • https://lutovadefok.weebly.com/uploads/1/3/3/9/133997447/4077200.pdfIn PDF document text
    • https://mutebomex.weebly.com/uploads/1/3/2/7/132740724/tugolapi.pdfIn PDF document text
    • https://waxajevigeko.weebly.com/uploads/1/3/1/4/131453715/3591454.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/wigarojutafoxu.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://s3.amazonaws.com/folexapurilowe/ruvinenirogon.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/18879255465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f9278c2-c77f-4ebe-be7a-9a609d3f9e15/nejatixekafipedofototu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27aac6d9-6a69-446a-9ea2-db5e51ea97b5/how_to_clean_a_stove_top_grill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba191ffa-fa0f-4cae-9332-47658f82f7fa/arduino_uno_circuit_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f5b8153-8ec1-4775-a36a-53e57324c0ee/2013_dodge_charger_rt_fog_light_bulb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/459576d4-0bfb-42c6-864b-7eff6c6fca4b/89417969601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3773c779-6d8d-4875-909f-cde8643a49e9/82412447296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad1ea5e8-aaf7-476a-9025-31249171906e/30353315954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07906518-0226-433c-ac22-d8e8832a2679/24251262078.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/xamoxumanevofij.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_off000118cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CC 4984 bytes
SHA-256: 67956844c954f78564f0ef63b69b5c07fdf1f64a36723a7a941b7fe3d0f5837f
font_01_sfnt_off000129be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BE 11420 bytes
SHA-256: 636d7541dd447390b4b83c030680f3713ecc64e8af318f2f6068d77f036eabb2
font_02_sfnt_off00015084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15084 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3