Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bbc65fb768b709…

MALICIOUS

PDF

80.7 KB Created: 2021-03-31 01:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6a2229ff0a6733117688e903a3d3e71 SHA-1: e6d5457791a1f29ce2061925a6ef9c3b63ed464b SHA-256: c5bbc65fb768b709ac3e736db8f09ee2cadca6748383c98200b1ccd35cf45b13
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to redirect users to other sites. One prominent URL, https://mezovuduw.ru/award?keyword=learning+and+development+plan+pdf, is directly associated with the file's apparent lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/award?keyword=learning+and+development+plan+pdf
    • https://sotezogurew.weebly.com/uploads/1/3/2/7/132740991/c9c9b84dcc.pdf
    • https://static.s123-cdn-static.com/uploads/4443356/normal_5fcc72ee23c1b.pdf
    • https://cdn-cms.f-static.net/uploads/4463785/normal_603e62c2cf083.pdf
    • https://cdn-cms.f-static.net/uploads/4417652/normal_6035b47ac418e.pdf
    • https://xofofafe.weebly.com/uploads/1/3/1/4/131438501/4c93bbf.pdf
    • https://cdn-cms.f-static.net/uploads/4506200/normal_602d693991c3e.pdf
    • https://static.s123-cdn-static.com/uploads/4446633/normal_5ff9b9ddcea50.pdf
    • https://cdn-cms.f-static.net/uploads/4476282/normal_6056c6fd8a60f.pdf
    • https://tusaluzope.weebly.com/uploads/1/3/4/3/134374665/juteper.pdf
    • http://tradebot.space/forgotten_realms_collectionye015.pdf
    • http://all-system7.work/819321130633n186.pdf
    • https://cdn-cms.f-static.net/uploads/4457620/normal_602ac5935b2a6.pdf
    • https://bodovusinorone.weebly.com/uploads/1/3/5/3/135347185/8917258.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d3a466ed-e3b2-4db6-b2dd-83c4d0eaff51/fundamentals_of_digital_logic_and_microcomputer_design.pdf
    • https://uploads.strikinglycdn.com/files/d96399b2-63a7-44dd-80d1-7cbae3eaa246/wafijebalifamakedi.pdf
    • https://uploads.strikinglycdn.com/files/c6d607e7-b5b8-401a-847e-293013b85b9b/could_thrawn_be_in_the_mandalorian.pdf
    • https://uploads.strikinglycdn.com/files/e26ccee1-c343-435b-b0eb-f73172629af0/me_before_you_soundtrack_zip_download.pdf
    • https://uploads.strikinglycdn.com/files/3ba2717a-c26e-47d1-81ca-e06308824223/vadexasiwozepot.pdf
    • https://uploads.strikinglycdn.com/files/e330f2fd-5a61-42b0-a885-e1162937f855/76671929359.pdf
    • https://uploads.strikinglycdn.com/files/40e6be9d-a370-4436-81da-2c1a8f32a3cb/pidabijeg.pdf
    • https://uploads.strikinglycdn.com/files/584509e0-c3fe-43be-82e2-06880a70a611/alamo_colleges_pay_grade_s09.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f085.bin
02263e8c6885b1866e9e19ea52a7e87633de944f1c9dcd0e1f84ac9a9e57bb64
pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 4972 bytes
font_01_sfnt_off0001015d.bin
c2205162d95013bcbe459090caf79098297a0b0642aec14c3d44672a6c0eca7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 11196 bytes
font_02_sfnt_off000127a0.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x127A0 4324 bytes