Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdc69d60d060631…

MALICIOUS

PDF

74.1 KB Created: 2020-11-14 10:57:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 80a0f9b783455c9e124fc8dec977fcca SHA-1: 23473b16ed6d58f778d5fced822e889aaf67c088 SHA-256: 6cdc69d60d060631285c7bc81ca09d24b76e137ee635e839a81ffbd5c1ccf24c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URL that redirects to a link farm, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown URLs strongly suggest a malicious intent to redirect users to harmful content. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafficel.ru/strik?utm_term=textfx+notepad+64+bit+download PDF link annotation
    • https://kuwavumiwedow.weebly.com/uploads/1/3/4/6/134673312/3153334.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/temimokevejopapax.pdfIn PDF document text
    • https://muborite.weebly.com/uploads/1/3/4/4/134442605/643ae58d41053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461484/normal_5fa36fd481e46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388841/normal_5f914df4e5512.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/libuzi_dajim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420449/normal_5f964b4743749.pdfIn PDF document text
    • https://xixivejeb.weebly.com/uploads/1/3/4/6/134603549/3353830.pdfIn PDF document text
    • https://zikenanevo.weebly.com/uploads/1/3/4/5/134589255/rusevukodosuzozafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393624/normal_5fa1768a1971f.pdfIn PDF document text
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/3440429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447662/normal_5f9f9bf9189f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424364/normal_5fa57f31c4e53.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/valewipe.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/garorowa/68899312662.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65E 5252 bytes
SHA-256: 090fc2a6df48c6748d3c204348e0da1c5ddc32beb0a283284526e5f964304f0f
font_01_sfnt_off0000d863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 14144 bytes
SHA-256: 69961289f7f69c7fb8b52e756ee5cc93b373fabd25e21c18c9f211615cb85bd5
font_02_sfnt_off000103af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 16368 bytes
SHA-256: 75bbd64fe87cf8fb7a4ce630cdbf1fa4d064521a118b7673c0aa2e1ecee9ee62

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