Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ebb43252d0df26…

MALICIOUS

PDF

73.1 KB Created: 2021-06-12 16:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d8bf46a89cac15677948c06906b266a2 SHA-1: 67edc24d6a513d52f4b584aaec115821dda4ea89 SHA-256: 24ebb43252d0df26ad2ad969b490aebfb00769533a60b8bddada6be20deed774
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one URL pointing to crysiq.ru. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification returned a high probability of maliciousness. The embedded links suggest an attempt to redirect users to potentially malicious sites or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crysiq.ru/pbw?utm_term=opportunity+example+in+swot PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383449/normal_60333cb5f2cce.pdfIn PDF document text
    • https://bijefalatobin.weebly.com/uploads/1/3/4/6/134629646/tofuwexagowono-robolawobum-serikulagige-gobifupenokes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_601753079b89a.pdfIn PDF document text
    • https://tusagenitig.weebly.com/uploads/1/3/1/4/131452801/dumejediwuraliwixun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451229/normal_60658dbd106ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386597/normal_6041c34e0e665.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392207/normal_5fe28d5a39441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474169/normal_600f27770fef9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405660/normal_606954f2baf28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391925/normal_5fd03f873ab02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489050/normal_5fc71e35a25d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_605714f568e61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vogivakazela.pbworks.com/f/derojusowifimorusixiko.pdfIn PDF document text
    • http://zexowisam.pbworks.com/w/file/fetch/144426927/65954661596.pdfIn PDF document text
    • http://bukafag.pbworks.com/w/file/fetch/145178319/tasabuso.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/f/jifukikokevofesipubu.pdfIn PDF document text
    • http://sejuworepow.pbworks.com/w/file/fetch/144564240/towilixopuzomuji.pdfIn PDF document text
    • http://mutoteja.pbworks.com/w/file/fetch/144515712/32944414192.pdfIn PDF document text
    • http://xujefix.pbworks.com/f/xubuku.pdfIn PDF document text
    • http://tebejeloxid.pbworks.com/w/file/fetch/144797265/how_do_you_spawn_a_helicopter_in_gta_5.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_off0000e276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 5252 bytes
SHA-256: 60796964a1223e964723241d2e620186ba41039d9e190d43fe01c2b75e907750
font_01_sfnt_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 10288 bytes
SHA-256: 50052d50deaa84e0979aba1ef05953272af0b129cb3df36e06fd01a0ffbdd034

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