Malicious PDF — malware analysis report

Static analysis result for SHA-256 851bb594e80a0c7a…

MALICIOUS

PDF

72.0 KB Created: 2021-04-01 00:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 443c8b62fb5f394c323eebbd5f60b70b SHA-1: 23bc1a0689d166a813db445c4f0fc2b2160ccd43 SHA-256: 851bb594e80a0c7a525da2ca79494acb9d137f81f989e2d4a9ff7acc5954a0a2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'comcast wireless dvr boxes' to drive traffic to these external sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a phishing or SEO-based malicious content distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=does+comcast+have+wireless+dvr+boxes
    • https://rororejiwep.weebly.com/uploads/1/3/5/9/135966539/07f6daf1b.pdf
    • https://nukanomipixi.weebly.com/uploads/1/3/2/7/132740264/vojolofuwapusopu.pdf
    • http://verifybadgesbusiness.com/imd_competitiveness_report_2017jgp1c.pdf
    • https://mikedexe.weebly.com/uploads/1/3/1/4/131452733/pekomajere.pdf
    • https://kelurefuvaw.weebly.com/uploads/1/3/0/9/130969237/5df2b56c.pdf
    • http://rawokixe.22web.org/dedulegawufadivakemavo.pdf
    • https://gasilarax.weebly.com/uploads/1/3/4/5/134595303/e6005.pdf
    • https://bipozoxadedisaj.weebly.com/uploads/1/3/1/1/131164124/7811619.pdf
    • http://razvivatel.blog/determine_the_moment_of_inertia_of_the_area_about_the_y_axis._4yx2utzyw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/87563158-6e55-494e-b24a-36dab9b54046/lexus_es300_for_sale_in_nigeria.pdf
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_83432e5005fe4c8787f000186b313802.pdf?index=true
    • https://uploads.strikinglycdn.com/files/af9af963-4a10-4b06-8526-b85eca46c08b/el_conde_lucanor_cuento_22_resumen.pdf
    • https://uploads.strikinglycdn.com/files/d8bc347c-ff30-4b0c-8e03-e3fab55461c3/rafinizax.pdf
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_b703820a8b984376bd7987fa8c0f02f9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/05f03c8b-72bb-4718-a304-8dc80832b3ec/stihl_trimmers_price_list.pdf
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_e470a57617ac44fbac4b32164e59fc27.pdf?index=true
    • http://gozulejawefufap.epizy.com/baxobusovotarufikevex.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_off0000daca.bin
210bfc81e5b4281c2488fb193832e0d233fe0cb26e0df095231e27f394ad945a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDACA 5540 bytes
font_01_sfnt_off0000ed85.bin
ad09a4b4367c25b178b585e7ec5e67fc6ee3cf70ec80650be429edaabef77a9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 11012 bytes

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