Malicious PDF — malware analysis report

Static analysis result for SHA-256 9735bbac2cd24cf0…

MALICIOUS

PDF

90.4 KB Created: 2020-12-16 04:51:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f0e97180165b88eea97083269722b7fc SHA-1: 1de45763e0f8c17e49931f95555cca1fa0be9e20 SHA-256: 9735bbac2cd24cf0bf00817c68106349633242ed09e99827e28eff3c974104d9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffi.ru/strik?utm_term=tv+moving+box+55+inch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f94e79e3fb71.pdfIn PDF document text
    • https://dajapofijakaf.weebly.com/uploads/1/3/4/2/134266914/3203695.pdfIn PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/puwamajimabisul_vozusaj_guvegula.pdfIn PDF document text
    • https://wetejitaxazis.weebly.com/uploads/1/3/4/3/134306742/14b8c9d.pdfIn PDF document text
    • https://lerexujirizafet.weebly.com/uploads/1/3/4/3/134344290/supizuwuzovuke.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/babesipaxuvujemefuxa.pdfIn PDF document text
    • https://wigowaziralo.weebly.com/uploads/1/3/4/4/134498628/xakuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_5f8f2fa885f5f.pdfIn PDF document text
    • https://vuzaruluweketex.weebly.com/uploads/1/3/4/4/134478477/lofanaj.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/1a194d84-91b8-4de8-bb53-00b108908056/kupakawivadusenag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f5bd29c-975e-4127-991d-b86da2a0d2cb/37232456968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dd2f6bb-1bd7-41eb-bb56-a870e43fc8aa/davixuk.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_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 5040 bytes
SHA-256: b9e8fb4499205a19aebf282e1c29ed0202485701a64714c58e7c5ebbab8098b7
font_01_sfnt_off000134b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B0 11580 bytes
SHA-256: efcfceef1e7561a84464c420c9082edce1f8ed4bff6e46afee479043ba123eaf

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