Malicious PDF — malware analysis report

Static analysis result for SHA-256 09732f4b3e9d9180…

MALICIOUS

PDF

74.0 KB Created: 2020-12-20 08:08:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fa4d06a2a9f53c148afafbc22a9f8e50 SHA-1: 013ef09ff3e68e6aedca463ed1f9e5ea17a38941 SHA-256: 09732f4b3e9d9180c97821db56e3266284d1c0fd57f180e1c76d9d0774cd2dde
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting and at least one to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. No scripts were extracted, but the PDF structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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 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.
  • 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://ggtraff.ru/strik?utm_term=asphalt+9+hack+ios+2020 In PDF document text
    • https://xajupodesuze.weebly.com/uploads/1/3/1/3/131380723/kovoxolufelafivo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_5fd9a04415ead.pdfIn PDF document text
    • https://vapojulugib.weebly.com/uploads/1/3/4/6/134669528/fubemikesevobepesopo.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/d33a4a57.pdfIn PDF document text
    • https://vidajubobulixi.weebly.com/uploads/1/3/4/6/134650234/8068082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393916/normal_5fb2c07b971d8.pdfIn PDF document text
    • https://kedixezowudogaj.weebly.com/uploads/1/3/4/6/134618790/ff63177f8bdc.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/1760e99f-e0e9-4ec6-bc9f-c005ccf04d6c/6526612474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68143399-c920-4be0-a6e2-2442b6d9ed49/nightmare_before_christmas_wrapping_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9893d24d-7e64-4624-8f4a-2b9cdc3dc3e7/wutugugenasoda.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/davis_animal_hospital_woodbury_ct.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/029cf8bc-4b6b-43d4-a1da-3cb0520a1956/jamba_juice_gift_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e072f449-12e8-4ef4-9adc-2da18ac624c7/kowepejofiroxejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39fa502c-7b72-4cdb-afdc-97bfe494ee28/99568033761.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD99 4972 bytes
SHA-256: c35aec8f456a6072c31104ab5c8d0b653e3dc8ae9064e0679b0ecb14ce8f3787
font_01_sfnt_off0000de6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6D 1956 bytes
SHA-256: 12856e2a8419ee26cf17265701ada4e06c644cbb697466eb1b676e57e57d630a
font_02_sfnt_off0000e7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 10756 bytes
SHA-256: 9904741f5a1137c148895d0dc7c91d97c5d0bba672fe497444dc26b72494b706
font_03_sfnt_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378