Malicious PDF — malware analysis report

Static analysis result for SHA-256 5832818e49c562ed…

MALICIOUS

PDF

74.4 KB Created: 2021-03-11 18:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01964946237c1e5c772e36cbab641338 SHA-1: 00d46a8d379da4530c62762b592f85269433781b SHA-256: 5832818e49c562edd46bfd06c8e170e4d1a1322e58d7e7c26007fc35360b97c9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics reveal a mass external PDF link farm, with numerous URLs pointing to potentially malicious content. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated programmatically to host these links.

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://pelibifir.ru/wix?keyword=elves+family+names
    • http://gazozasi.scienceontheweb.net/64272400121.pdf
    • http://leseweremizew.scienceontheweb.net/why_does_my_cctv_dvr_keep_rebooting.pdf
    • http://jolijivik.scienceontheweb.net/energia_eolica_2020.pdf
    • http://netubekebusis.iblogger.org/68504038185.pdf
    • http://konujojijitezu.iblogger.org/graphic_designer_portfolio_website_template.pdf
    • https://cdn.sqhk.co/pifajaloro/jjE4OKr/vezevivuda.pdf
    • https://befunopokoxa.weebly.com/uploads/1/3/5/3/135327779/1d8de16debb.pdf
    • https://cdn.sqhk.co/zasokolof/vgfjdhf/xazevoxefivujunanavi.pdf
    • https://cdn.sqhk.co/gusisezepemu/igGtYhd/letelejutanuxad.pdf
    • https://cdn.sqhk.co/guvevifowo/jdhgZev/suludukefuwofedaj.pdf
    • https://cdn.sqhk.co/weluwexo/hiWRzih/easy_ice_cream_recipe_no_condensed_milk.pdf
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/2749915.pdf
    • https://cdn.sqhk.co/zuzipogowita/hbieia3/10070684995.pdf
    • https://cdn.sqhk.co/kosenopelid/igtgiD8/81110455148.pdf
    • https://feveronibamuja.weebly.com/uploads/1/3/5/3/135300243/dexatagu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wejufutaz.onlinewebshop.net/44989420680.pdf
    • http://puwixatokido.epizy.com/how_to_use_ryobi_1700_psi_pressure_washer.pdf
    • http://jelazub.rf.gd/55295919518.pdf
    • http://bozuguluro.rf.gd/can_you_make_sourdough_bread_in_a_panasonic_bread_machine.pdf
    • http://bofisul.rf.gd/59095037764.pdf
    • http://nikofutame.rf.gd/free_prayer_books.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_off0000e7aa.bin
ab4da200d91e986702aab23a2182757e227b93857b36ea3f352ff85a297a418c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AA 4936 bytes
font_01_sfnt_off0000f87c.bin
289b752a64ddc56690a36be173078178b170234e6b99b01a6e2d38f67ea2abad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 10528 bytes

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