Malicious PDF — malware analysis report

Static analysis result for SHA-256 552bb37d9eb5af79…

MALICIOUS

PDF

75.0 KB Created: 2021-03-12 08:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2bd083164d45ba5778a91370a5b19de4 SHA-1: b56188bc7432e26ee7063974ef889c41cdaf517a SHA-256: 552bb37d9eb5af79c5c5d760bce90af5423d3e62e6eb3fbd93bbccf0dd692f84
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO manipulation and to redirect users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://vilenefex.ru/award?keyword=animal+cell+and+plant+cell+parts+and+functions+pdf PDF link annotation
    • https://cdn.sqhk.co/rulopojuna/figeo7N/download_grid_maker_for_instagram_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/ichf1rU/29969948804.pdfIn PDF document text
    • http://tpdreport.com/75473932044cspfv.pdfIn PDF document text
    • http://firstflirts.site/nuzadovapvdg3y.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/jeEYugj/american_crew_fiber_cream_tube.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/jgqgjhi/18098670659.pdfIn PDF document text
    • http://trylait.club/simibeditiguzobumibonudah0nrf.pdfIn PDF document text
    • http://getliterate.online/does_apple_store_charge_a_restocking_fee2w27g.pdfIn PDF document text
    • http://idealslimitaly.site/maguzazulomabup4t4c6.pdfIn PDF document text
    • https://cdn.sqhk.co/maxolavoweje/ghzJ0je/13381342192.pdfIn PDF document text
    • http://beamorem.com/29793761229odpwk.pdfIn PDF document text
    • http://azorocheat1.xyz/sujudajusuxafunolapokife86.pdfIn PDF document text
    • http://beautysss.site/what_is_the_best_lg_tone_bluetooth_headsetiuw3g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/dalebelip.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/endangered_animals_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/hand_of_fate_2_gold_token_guide.pdfIn PDF document text
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_88889ef28c1142b6a1ea030ca3320ddf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lanaladu/zifiginenugipu.pdfIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_2d72443cd18640dab04f9f1734aae4c9.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_0d1211cf48c94d4e850563e1681e522b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dinilederu/benogur.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 5288 bytes
SHA-256: 77f29c0bd6928908c22c03f1176a4c12753344b996bd599bfb5f1459f3752fdf
font_01_sfnt_off0000fac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC3 10396 bytes
SHA-256: 49c1ded3bfb40bb5731832d64934ba4a9a11f7a223cf09d2d84a4bdcf504fdd6

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