Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42db51d06eddf57…

MALICIOUS

PDF

68.7 KB Created: 2021-02-13 14:19:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 84a1cacd97eaac1c62fcb4dcd244c6e3 SHA-1: da1e48a3c736f899cdbf91209e1bdca6a1aa799b SHA-256: b42db51d06eddf576708bd2a8fc84001447f4d6cd63e582d5b18cb2cf7911e7f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing infrastructure. The document body, though heavily obfuscated, contains text related to a game ('4 pics 1 cartoon answers 8 letters') which is likely a lure to encourage users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=4+pics+1+cartoon+answers+8+letters PDF link annotation
    • https://cdn.sqhk.co/tevotapomow/vgcCghe/75295354018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401694/normal_5fe69be23ddda.pdfIn PDF document text
    • http://activa-fb.com/boleyn_anna_knyv067b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_6019baaf517fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406809/normal_5fe3cc83c5550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_600d4b9178b95.pdfIn PDF document text
    • http://awpmode.com/929164491054in9x.pdfIn PDF document text
    • https://fisezofibidan.weebly.com/uploads/1/3/4/3/134316577/gikukibo.pdfIn PDF document text
    • http://cparta.moscow/memerebotufod5denx.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/dD3fhaB/xurenixanedipo.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/6158930.pdfIn PDF document text
    • https://sabidodavo.weebly.com/uploads/1/3/1/4/131408103/6661538.pdfIn PDF document text
    • https://cdn.sqhk.co/govulasem/ghjghI7/mobenazuwupi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_5fe8f25247ca1.pdfIn PDF document text
    • https://bugevokugado.weebly.com/uploads/1/3/4/8/134870551/4035240.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzosiboweja/jlifaA6/pujorakevuxafigilizomi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408343/normal_5fc67b21930ff.pdfIn PDF document text
    • https://cdn.sqhk.co/nifijagik/dHiasid/69857113426.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D9 5256 bytes
SHA-256: cb852a76a0080e88eb861f99b2576c6427779ff2b982b0c9022b5d3b9961dbc3
font_01_sfnt_off0000e2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E3 10424 bytes
SHA-256: e6228a3808f91b25e74dd69955c78f2826c4cf37de25710d83aee861da76468c

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