Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca9664b02d13cea…

MALICIOUS

PDF

78.7 KB Created: 2021-05-10 01:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c634134ad5281676f799b33f6296dc6 SHA-1: 9e581d9473fbf9fa7acabc78e54991c7df094cd0 SHA-256: 9ca9664b02d13ceaa42fb7815636e8c4a429fd9feeb995a88385b2c3b2461021
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous external URLs, with a specific focus on SEO manipulation and potentially phishing. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/strik?utm_term=how+many+jesus+miracles+in+the+bible
    • https://xulasimij.weebly.com/uploads/1/3/2/8/132814518/pawonog-pixuv.pdf
    • https://depularo.weebly.com/uploads/1/3/4/6/134601330/05579e2b2013.pdf
    • https://zulunapakaf.weebly.com/uploads/1/3/1/0/131070820/b1bd339c6.pdf
    • https://motuzepiruwilo.weebly.com/uploads/1/3/4/3/134348631/bbef261018bf.pdf
    • https://cdn.sqhk.co/fenazijeguk/igcpu2V/64177231157.pdf
    • https://cdn.sqhk.co/melipetoluf/bgchcbw/chrome_music_lab_song_maker_havana.pdf
    • https://cdn.sqhk.co/kutajanode/QghI2jd/mobile_png_download_link.pdf
    • https://static.s123-cdn-static.com/uploads/4402956/normal_5fd0931adc66d.pdf
    • https://cdn.sqhk.co/fufitefan/i6hhkge/zituxakedotefew.pdf
    • https://zuzolavilasobin.weebly.com/uploads/1/3/4/5/134523903/114931.pdf
    • http://votixibutiro.medianewsonline.com/zozuxufimime.pdf
    • https://cdn-cms.f-static.net/uploads/4380213/normal_5fe8f171ba361.pdf
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/fixagevedixin.pdf
    • https://duvigenusidila.weebly.com/uploads/1/3/4/7/134736387/puzewutinaziwazid.pdf
    • https://cdn-cms.f-static.net/uploads/4485152/normal_6064f8a827834.pdf
    • https://static.s123-cdn-static.com/uploads/4404105/normal_5fd088bcde2d4.pdf
    • https://dozajumeguru.weebly.com/uploads/1/3/1/3/131379069/3150661.pdf
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/1589447.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c69a8150-bb1e-4c46-878b-fc1622391bd7.filesusr.com/ugd/cf91d6_5574990fe5af489fb30694be11aa60fc.pdf?index=true
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_e522a9f4ea2c4ae79cec5af7cfde6557.pdf?index=true
    • http://biwefejiza.myartsonline.com/borderline_personality_disorder_inventory.pdf
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_f09280e4d1814812ba1c4479d4df4b3f.pdf?index=true
    • 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_off0000f548.bin
e034990c0210d45b28e2a2c85148026dece77dea1c0f18b00e229836a2a9fe50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 5408 bytes
font_01_sfnt_off00010791.bin
360fe876caffba62ed195b60fcf6e47ff82912248205a717d1d971a43430c048		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10791 11080 bytes

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