Malicious PDF — malware analysis report

Static analysis result for SHA-256 9694c5943ef6aeab…

MALICIOUS

PDF

86.2 KB Created: 2021-05-31 21:39:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23ca4f6ec4b09122e0bb26a776318a8a SHA-1: 693f38caef03824624ad7531106a11b7c7e93307 SHA-256: 9694c5943ef6aeaba6173607e65f22eb1366a2fba896b161b720db83f207717c
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 as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/wb?keyword=are%20gluten%20free%20oats%20ok%20for%20celiacs
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/jonigip-roxot-puniwomofexim-tejudel.pdf
    • https://cdn-cms.f-static.net/uploads/4379736/normal_600b782d1db82.pdf
    • https://kazusabetife.weebly.com/uploads/1/3/5/3/135318045/7d0a4ca75361d2a.pdf
    • https://cdn-cms.f-static.net/uploads/4427781/normal_5fe7cdbe4f632.pdf
    • https://vipeketiduwe.weebly.com/uploads/1/3/1/6/131636725/c1a86b6aaa0a.pdf
    • https://kezugefoluvero.weebly.com/uploads/1/3/1/8/131856244/movezujel.pdf
    • https://karupijelajedo.weebly.com/uploads/1/3/4/8/134878973/5040157.pdf
    • https://tevufipe.weebly.com/uploads/1/3/1/6/131606546/1937547.pdf
    • https://nakipubupuloda.weebly.com/uploads/1/3/4/5/134589887/madunutodir.pdf
    • https://vunakeba.weebly.com/uploads/1/3/4/6/134623580/suvaxigonedi.pdf
    • https://jipunone.weebly.com/uploads/1/3/5/3/135349916/8131402.pdf
    • https://xasopivuzag.weebly.com/uploads/1/3/5/3/135333163/tejamopetitadu.pdf
    • https://gefipozaxafuni.weebly.com/uploads/1/3/5/3/135312829/pakoz.pdf
    • https://gatimosuxanad.weebly.com/uploads/1/3/2/8/132814295/164576.pdf
    • https://static.s123-cdn-static.com/uploads/4485821/normal_5fcc594842fb3.pdf
    • https://kojepogezoxuta.weebly.com/uploads/1/3/4/4/134487575/ribiburefosi_tazogi_kuges.pdf
    • https://bitilidejiv.weebly.com/uploads/1/3/4/4/134442737/ruturetev.pdf
    • https://piturerakilapes.weebly.com/uploads/1/3/0/7/130775197/8688666.pdf
    • https://wewowalowumuv.weebly.com/uploads/1/3/4/0/134040384/14b1ebd9e31.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tiduxikuve.pbworks.com/f/oromo_amharic_dictionary.pdf
    • http://zezimin.pbworks.com/w/file/fetch/144412821/stative_and_dynamic_verbs_exercises_multiple_choice.pdf
    • http://kipizasuzeda.pbworks.com/w/file/fetch/144416733/what_are_the_two_main_theories_of_language_acquisition.pdf
    • http://jesababa.pbworks.com/w/file/fetch/144413874/tidun.pdf
    • http://rugewenuzed.pbworks.com/f/88760676724.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_off0001135f.bin
02981b0c3f133617522d7db764b92e0d5a10107331ca7181f918b117fc2b159c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1135F 5104 bytes
font_01_sfnt_off000124d5.bin
95ad1d4e92d5bed79732ef549efa5cfc97e4497df9cedcae92d91f7f7335b2ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124D5 11472 bytes

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