Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3d984b5ad3cbd7…

MALICIOUS

PDF

72.5 KB Created: 2020-11-23 06:24:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9b834b88dfe66c15370b060e00b3202 SHA-1: 77f7e604439b11f4ca714886cf633857f820b862 SHA-256: 8b3d984b5ad3cbd726cb2cc47beb106cac21416dcbfd240ce90be324c85ce6c1
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 PDF link farm, with one prominent URL pointing to a suspicious domain. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content or phishing sites.

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://trafffi.ru/aws?utm_term=big+fish+casino+unlimited+chips+apk
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/namari.pdf
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f964adac99d6.pdf
    • https://cdn-cms.f-static.net/uploads/4415534/normal_5fa3adf3a4e8f.pdf
    • https://manadazalivufud.weebly.com/uploads/1/3/4/3/134358645/kizedetokero.pdf
    • https://cdn-cms.f-static.net/uploads/4392868/normal_5fb57420c8980.pdf
    • https://fisofomopix.weebly.com/uploads/1/3/4/6/134603918/milotufugi-belan-kadipesofejinop-xefogimozapawe.pdf
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/leparijov.pdf
    • https://cdn-cms.f-static.net/uploads/4368748/normal_5f985209dff58.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5848d2d2-81c6-422a-833e-da4d2f06df50/alfred_adler_theory_of_motivation.pdf
    • https://s3.amazonaws.com/lewuli/crash__bernstein_episodes.pdf
    • https://s3.amazonaws.com/nazekisigiduz/jexelegepujulozen.pdf
    • https://s3.amazonaws.com/bunobu/tetegegitopimaguxijowazaf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c609.bin
075ac63b6b43f9b3715a7d3052b69fcbd8e2c9569b03b244e687a426a6cffee9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC609 5584 bytes
font_01_sfnt_off0000d8f7.bin
56857f26e49c836b31a1067edb1555dbef3960dee8bd03571254b692384d5024
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 11208 bytes
font_02_sfnt_off0000ff49.bin
7e3c665d02ee0a48e1923e1b8a614f2fa6b15db6db37b38eccd0bca32143fa5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 16272 bytes