Malicious PDF — malware analysis report

Static analysis result for SHA-256 33116f889dffe492…

MALICIOUS

PDF

77.4 KB Created: 2021-01-05 17:31:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 17bbda67353d2c98576a28386f04e28b SHA-1: 78738db97fe3c52503b584558d312cde6cb568c1 SHA-256: 33116f889dffe49246c389478cb33dbf7d8de8765cdafc2af85cd3e47b9afc61
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the PDF's structure point towards an attempt to lure users to malicious sites.

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 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://trafffe.ru/123?utm_term=.40+vs+9mm+ballistics PDF link annotation
    • https://kudizuvawemexol.weebly.com/uploads/1/3/4/3/134307781/5267097.pdfIn PDF document text
    • https://cdn.sqhk.co/mofipife/cDdicOH/spider_bites_symptoms_treatment.pdfIn PDF document text
    • https://mosezogojufotu.weebly.com/uploads/1/3/0/8/130813841/693b9e92f5bd28c.pdfIn PDF document text
    • https://rofovotojoroko.weebly.com/uploads/1/3/4/8/134878837/4085423.pdfIn PDF document text
    • https://fenorepaxok.weebly.com/uploads/1/3/1/8/131856491/436917.pdfIn PDF document text
    • https://valogasode.weebly.com/uploads/1/3/4/3/134320371/xinisajakolerapubupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467300/normal_5fb9f6eb7e5a0.pdfIn PDF document text
    • https://cdn.sqhk.co/sifolilo/J4MheLt/zapogodatizorodoxasida.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5fb5d2a-dca6-458a-8f33-6db6b6f49be2/20152851040.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/72836915571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e545b1-bde0-4ae5-a25d-9ed70d9eb04c/gapopivuwefumodivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d31e92be-adfd-4e86-9067-36cff9380201/jepupakikorakexelinagom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6fcb2d8-3137-4d98-a531-148561c64bfb/womens_role_and_importance_in_the_french_revolution_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e5ddb2-ba9f-4223-b3e8-cea34e28af5e/borderlands_2_best_sniper_rifle_code.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_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 5372 bytes
SHA-256: f06247ddb8b07b54e7612b5e7081825cf72ee693dae363dd509d41c9d5410e35
font_01_sfnt_off000102b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B0 11196 bytes
SHA-256: f225cf7d70521f5f7da5a8c8d0dbb17fabe6164e3fba445e71bd65d3a9670853

Open this report in the interactive analyzer, or submit your own file for analysis.