Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b81d0a260cca36…

MALICIOUS

PDF

73.0 KB Created: 2021-03-26 18:28:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be81450b676360021a32789da7db643d SHA-1: 3c5c1dd9610e1479515f3da6a243705ebef5bd0e SHA-256: 44b81d0a260cca36593b8cf06ad403f74ba386301f3ab4863c7b35b208d7722f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier also strongly indicate malicious intent. The embedded URLs point to various PDF files hosted on external domains, likely serving as a distribution mechanism for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/award?keyword=cello+music+sheet+pdf
    • https://cdn-cms.f-static.net/uploads/4413007/normal_60196877cb035.pdf
    • https://tijikazi.weebly.com/uploads/1/3/4/3/134373218/rapiwagujifaxelugova.pdf
    • https://cdn-cms.f-static.net/uploads/4419623/normal_601df34fa3ec6.pdf
    • http://tiluvopira.medianewsonline.com/gixunofuloxu.pdf
    • https://cdn-cms.f-static.net/uploads/4370278/normal_60404835350bf.pdf
    • http://wimuzawoxi.getenjoyment.net/liberation_rosary.pdf
    • https://likobikumenaf.weebly.com/uploads/1/3/5/9/135961418/8929166.pdf
    • https://xopezafetuwov.weebly.com/uploads/1/3/5/3/135314897/mebobuwoxijabez.pdf
    • https://cdn-cms.f-static.net/uploads/4379034/normal_601b5d251c5fd.pdf
    • https://novufetus.weebly.com/uploads/1/3/4/1/134131343/liwabanow.pdf
    • https://cdn-cms.f-static.net/uploads/4453333/normal_5fe8eeb47101c.pdf
    • https://cdn-cms.f-static.net/uploads/4370764/normal_6031d0696a5d4.pdf
    • http://dosubodanes.mypressonline.com/93356830476.pdf
    • https://vakonawokedoze.weebly.com/uploads/1/3/4/5/134522954/votetobe.pdf
    • http://garanibukumom.scienceontheweb.net/beginning_latin_poetry_reader.pdf
    • https://cdn-cms.f-static.net/uploads/4465687/normal_600aa4a816498.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://legokejapo.atwebpages.com/anorchia_adalah.pdf
    • http://nowageg.onlinewebshop.net/advanced_vocabulary_words_and_definitions.pdf
    • http://tofujuwo.onlinewebshop.net/14393325705.pdf
    • http://vepitejususas.atwebpages.com/58774916595.pdf
    • http://jigisasamupor.onlinewebshop.net/21953947318.pdf
    • http://mivurukelino.onlinewebshop.net/palebemikamesu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1db.bin
49ceea11b74d1c5aa294ff913b7b330856b07e7311777bf6db85a9b43cb92fc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 4992 bytes
font_01_sfnt_off0000f2b6.bin
63f46a0917404b7569f70ac7801eb9685e752f9930c3dfd9aefefd41d039f692		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 10492 bytes

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