Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e0ffdd796478cb5…

MALICIOUS

PDF

88.4 KB Created: 2021-05-24 13:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a87ca5ac883eef3fd609628d652d96ac SHA-1: 7267f93bd67b500d26fedadddd08fc3a4af5c480 SHA-256: 7e0ffdd796478cb5ccf30dc871df03e3d877690960957716a1c1d76f9fa6dc16
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the PDF_SEO_LINK_FARM heuristic point towards an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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://pelibifir.ru/strik?utm_term=bingo+lucky+bingo+games+codes
    • https://mefanajumajadip.weebly.com/uploads/1/3/1/6/131637152/puxisesiwexe.pdf
    • https://static.s123-cdn-static.com/uploads/4482645/normal_5ff68baa75a64.pdf
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5fd13af344c44.pdf
    • https://static.s123-cdn-static.com/uploads/4455183/normal_5ff0183a990f7.pdf
    • https://nogalagamepet.weebly.com/uploads/1/3/0/7/130738620/gilige-tokemun-sawav-rufixanajaruja.pdf
    • https://cdn-cms.f-static.net/uploads/4376858/normal_60177319250c6.pdf
    • https://duvefotod.weebly.com/uploads/1/3/1/3/131380754/rajokenumudema-folegu-gumuzid.pdf
    • https://static.s123-cdn-static.com/uploads/4377679/normal_5febf6bb0b0a7.pdf
    • https://cdn-cms.f-static.net/uploads/4367635/normal_603406ba4e25e.pdf
    • https://cdn-cms.f-static.net/uploads/4377656/normal_604d67e3e3e0c.pdf
    • https://cdn-cms.f-static.net/uploads/4485711/normal_60111d283191f.pdf
    • https://static.s123-cdn-static.com/uploads/4403565/normal_5ff1d3af54739.pdf
    • https://lagubezawepafu.weebly.com/uploads/1/3/1/8/131856446/9093400.pdf
    • https://relabibede.weebly.com/uploads/1/3/2/8/132816075/jizudimura-zurukebup.pdf
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/maburapodixafenez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bexolamabad/caller_id_hider_for_android_free.pdf
    • https://s3.amazonaws.com/ropuba/is_panda_express_really_bad_for_you.pdf
    • https://s3.amazonaws.com/mejobu/9785537148.pdf
    • https://s3.amazonaws.com/zagubip/25070179344.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbaa.bin
0fb9b79f6140418732f6e33bdf11e8cc2e75223d439be8fb2cfd5a44e9d2df56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 5520 bytes
font_01_sfnt_off00010e66.bin
635ab073feb9f1310414136ae948304a01733549f1d864f5a10a2cf3fbc36a3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E66 2012 bytes
font_02_sfnt_off000117c4.bin
9a8e7d02fcec28eaab7638bdbeb4bc80c7e1a3a200d63a7d5a769651bfc8fe8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117C4 10720 bytes
font_03_sfnt_off00013c84.bin
d9189c5ccb2405f97e20c1fe39877d0b26f5f6776cb6b744ab83bf64b46bba7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C84 16952 bytes

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