Malicious PDF — malware analysis report

Static analysis result for SHA-256 8596151579d9e1c4…

MALICIOUS

PDF

79.1 KB Created: 2021-03-26 08:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efe696a6bfca749009077b0021e96053 SHA-1: 1abd339a786b6b6b58939ecef9706f9eb730fd0c SHA-256: 8596151579d9e1c45139189c6b0b83c1f7873c0bb4134df78c051cca7aa99b25
96 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, directing users to a suspicious URL. The document body, though heavily obfuscated, contains text related to accounting responsibilities, likely a lure. The presence of embedded URLs and the ML classifier's high confidence indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://seumenha.ru/strik?utm_term=chapter+14+accounting+responsibilities+quizlet
    • http://petuvinopezana.iblogger.org/carmina_burana_letra_completa.pdf
    • https://cdn.sqhk.co/mekurapiw/giLSdhc/infinity_war_cast_characters.pdf
    • http://tanuwoxomasosog.22web.org/first_grade_go_math_curriculum_map.pdf
    • https://cdn.sqhk.co/nedupugifuka/7qjhNxS/blades_of_brim_mod_apk_rexdl.pdf
    • https://cdn.sqhk.co/bilanogakiw/1jejtjf/jesuv.pdf
    • https://jupurelapuloful.weebly.com/uploads/1/3/3/9/133997255/lobofajetizalav-pedobeniminal.pdf
    • https://fowuwulavo.weebly.com/uploads/1/3/4/7/134754099/cec2975a.pdf
    • http://gebiponakefijar.22web.org/73583791163.pdf
    • https://kamedewogivazu.weebly.com/uploads/1/3/4/0/134096977/wegobeva_wowozepiwupogus.pdf
    • https://venunuwaxel.weebly.com/uploads/1/3/2/7/132740799/d3507fea33ce5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_6873c37bc82b457e8ba8aa8d149db1b5.pdf?index=true
    • http://timojakizufijad.rf.gd/how_to_train_your_dragon_movies_4.pdf
    • https://s3.amazonaws.com/fodose/what_is_communication_in_social_care.pdf
    • http://fugewad.rf.gd/ffxi_nasomi_goldsmithing_guide.pdf
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_b32e301dfb7b42c9abf025bec16faca6.pdf?index=true
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_c9d0b6fdb72f4354b07e985336f3817a.pdf?index=true
    • https://s3.amazonaws.com/fokapikow/mawivejovetiwiwakidovolil.pdf
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_0c805082c5fa4dc0bfdfb74243285fa6.pdf?index=true
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_c21499298f314fe89f402c4a130ecd42.pdf?index=true
    • https://s3.amazonaws.com/kitakilesa/mapubalezopixofojinubinu.pdf
    • https://s3.amazonaws.com/tipikaxe/pioneer_deh-p55bt_reset.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_off0000f4d2.bin
dafaf18ee9d0170f1e68dfa453336a7a188a4fb0a8f59a9c4c62cb7cbc45deed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 5556 bytes
font_01_sfnt_off000107b6.bin
2ed82eb855e724a93ce3d06f549c389c96dafaf9987fe54d1c433c53f644ce4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 10944 bytes

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