Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3488b0258aff49…

MALICIOUS

PDF

80.0 KB Created: 2021-05-23 23:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 31339b43e6934269f81b7c5d628d1cd7 SHA-1: 585c3fc60f4b260ffd21d864ec940837ac7cd23f SHA-256: 6c3488b0258aff49b5a2e24fcddedd41fe9956958fe17c1ac037752edc6f28b3
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 0.9998

Heuristics 6

  • 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 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://crophysi.ru/strik?utm_term=are+crape+myrtles+messy PDF link annotation
    • https://gegilegaf.weebly.com/uploads/1/3/1/3/131383227/nuwalanazavubab.pdfIn PDF document text
    • https://pivatebovuwize.weebly.com/uploads/1/3/0/7/130775292/sifor-mijamazu-befojovafamof.pdfIn PDF document text
    • https://kibalenujodoziz.weebly.com/uploads/1/3/0/7/130776895/1444574.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471467/normal_5fde93b3c4e86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463034/normal_5fd2f21cdc30a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_60208ddc53ff0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492575/normal_601845f7e7ac4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500667/normal_5ff16d97e7fcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485309/normal_6036bf96c241e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369909/normal_5ff53fd9ce202.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/natuguge_gedide_jirenifux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482218/normal_603e4b6d31354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_606d67bccdbb3.pdfIn PDF document text
    • https://tunupufimudodo.weebly.com/uploads/1/3/4/3/134324073/caf6d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/sonic_blast_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/problemas_de_probabilidad_y_estadistica_resueltos_para_secundaria.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/korebinebimemagute.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_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 4132 bytes
SHA-256: 9bcc7de4c37f00f122f612477690bc4cbfba0ac69ea22c2bf0af090b2abf46d1
font_01_sfnt_off0000fafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 5172 bytes
SHA-256: 8507cdaf4fb9ccaae09b03b485c84ae368e1ac38d777b66c747648a24bfda8c6
font_02_sfnt_off00010c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 11740 bytes
SHA-256: 40ed060a8a47423648f63916ec40d377418e3b71c754ae5f51e8f675fc1e0b18

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