Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8500ffd459fc05d…

MALICIOUS

PDF

77.6 KB Created: 2021-03-11 10:14:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73372c0fca99cee554308f1e9bfc5a9e SHA-1: d9ab71a44293d1eb547cb8767e0bb38666129c59 SHA-256: b8500ffd459fc05dcd6e6dce74d900313192cf7836b7f5e0a331b55e6550a1fb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain ('ponafet.ru'). The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to create a link farm or distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/wix?keyword=fastest+horse+in+minecraft
    • https://bazuxenulasiv.weebly.com/uploads/1/3/0/7/130740357/wotavixenene.pdf
    • https://watagejikifawup.weebly.com/uploads/1/3/4/5/134589749/6800335.pdf
    • https://dinufipaxa.weebly.com/uploads/1/3/4/4/134440308/dojorozivekoguzu.pdf
    • https://bojibelatos.weebly.com/uploads/1/3/4/0/134040608/5266308.pdf
    • https://mototide.weebly.com/uploads/1/3/2/7/132710683/9603ab70c3.pdf
    • https://kigukudisan.weebly.com/uploads/1/3/5/3/135321724/bodubivaxigal.pdf
    • https://xoxoxiwozolem.weebly.com/uploads/1/3/0/7/130739626/fd4cd8e3b2a69.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_8762f977477a4b46b2bce004b906116f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6ca45622-dec3-408d-bcf1-db38747841c6/how_to_remove_a_hot_tub_filter.pdf
    • https://s3.amazonaws.com/vavale/teacher_s_guide_wonders_3rd_grade.pdf
    • https://s3.amazonaws.com/bokofapig/kadejaximetirozaber.pdf
    • https://uploads.strikinglycdn.com/files/712be1b3-d4c1-40d3-8f5d-77508d2af875/motuw.pdf
    • https://uploads.strikinglycdn.com/files/5d60c35b-7e78-4d3b-bc2a-add3d849c229/xamut.pdf
    • https://uploads.strikinglycdn.com/files/362fdfaa-459c-4a99-9703-27eaa7aa8b7e/dewelix.pdf
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_f35b53250b0740bbb3729151235f1621.pdf?index=true
    • https://s3.amazonaws.com/liguwubore/french_worksheets_on_definite_and_indefinite_articles.pdf
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_73ed33f258fd4d0bb96c762a02cb358d.pdf?index=true
    • https://s3.amazonaws.com/bupaxomu/lagu_ending_baka_to_test.pdf
    • https://s3.amazonaws.com/lomogas/febutizifosozofopedexage.pdf
    • https://s3.amazonaws.com/vuraradaso/sony_hdv_1080i_video_camera_manual.pdf
    • https://s3.amazonaws.com/dorobukasawituw/rhyme_words_for_freezer.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_off0000f3df.bin
b493341618156212d7dc6de858bc3afb6a055734666ae946124a1dca31a4cc8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 5044 bytes
font_01_sfnt_off000104dd.bin
d8f68f31d617ab256a675e1f6a4905a7fdb50baaa82021307320a5e7ab55b2a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 10600 bytes

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