Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe676f12ebb16ce2…

MALICIOUS

PDF

72.1 KB Created: 2020-11-25 12:12:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e237676d3416eb2e9ea5dd6a2e41c3f2 SHA-1: 267b41bc1e13e78afa6410f4f610c681cb1ef995 SHA-256: fe676f12ebb16ce21d16aa362b118525384ac3fe80038f7aa968faa28f10cc2b
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, many pointing to disposable hosting services, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

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://trafffe.ru/strik?utm_term=difference+between+positive+and+negative+feedback+anatomy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407997/normal_5fa25522646d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378606/normal_5f93eb9141b96.pdfIn PDF document text
    • https://piminuwimizo.weebly.com/uploads/1/3/4/6/134674326/junevinigenev.pdfIn PDF document text
    • https://vemudafu.weebly.com/uploads/1/3/4/6/134655664/babeguxeki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409413/normal_5f93317d4cfaf.pdfIn PDF document text
    • https://jisogixisizula.weebly.com/uploads/1/3/4/3/134328009/mowibizademezin_pogari_muwonadi_tidebokizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379362/normal_5fa389dbaa4a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383577/normal_5faf69bd73fc4.pdfIn PDF document text
    • https://xeludelibiw.weebly.com/uploads/1/3/4/3/134371965/dutes-xavaj-mopufepamoxob.pdfIn PDF document text
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/naretoxenotasorizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376629/normal_5f8a8a761ae10.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/rilik-guwuj-rexosigevipu-mobukumerus.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/bizamesuwepe/bose_speaker_manuals_online.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_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 5900 bytes
SHA-256: 87d6bc7b18f8664395d1a105941654543098233756a2148f18ee289450df26ad
font_01_sfnt_off0000ef69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF69 10384 bytes
SHA-256: 5b0a12c096c783742fbf889a256609f16273b80d343ee206c26b8e158d064c38

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