Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d5c918bbfa92eb…

MALICIOUS

PDF

74.2 KB Created: 2021-03-18 23:30:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55494dd3f8aaeeb70b2c3fd78783a128 SHA-1: 0168c9ac1ea8077c3958fe6fd20d03ad4707ce29 SHA-256: 71d5c918bbfa92eb88cad5c633b14098ac3fa6cdf24ca61ccca778dd1fd44ee0
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/award?keyword=bell+s+palsy+exercises+spanish+pdf
    • http://1fps.ru/terminator_1_imdb_parents_guidet5k3y.pdf
    • http://lalat.space/glitch_cam_pro_apk_free_downloadaz0ht.pdf
    • https://buzoraxuv.weebly.com/uploads/1/3/4/3/134366179/2c763.pdf
    • http://buyfastedcircle.xyz/stickman_dash_hooksvx6nq.pdf
    • http://kagaromorin.medianewsonline.com/2005_honda_pilot_owners_manual.pdf
    • http://lenusabipowezo.getenjoyment.net/duxupupobujusivevetiwag.pdf
    • http://salearea.pro/jizarolemusamizevodepuwtcdr.pdf
    • http://hihikane.space/podigogazgu5a0.pdf
    • http://rocketdocs.us/54309440964v703p.pdf
    • http://trydouche.xyz/65582721695ud37g.pdf
    • https://kekisuganuzab.weebly.com/uploads/1/3/4/7/134721312/fifem_zabujarerebef.pdf
    • http://robolab.one/282880270088v3i8.pdf
    • http://gajelifuluxapov.mywebcommunity.org/sony_ps_vita_slim_2000.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_73789558be9c442482a9cb16b2293ae9.pdf?index=true
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_98b93714366443659e77641b807ee34c.pdf?index=true
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_6e626d265f994c6587e2085db63cdc40.pdf?index=true
    • https://s3.amazonaws.com/mijumomub/plural_form_of_word_abacus.pdf
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_1e3d70b91d964a9b8c4b5e257ee047d7.pdf?index=true
    • https://6674166f-eb58-46b1-9d38-a528bc95e02c.filesusr.com/ugd/e38d8e_45217f0aa9c741a091cd5c87b663750a.pdf?index=true
    • https://s3.amazonaws.com/kisimujuk/free_java_football_games.pdf
    • http://xakagigoneliv.myartsonline.com/why_my_ac_is_not_cooling_car.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_off0000e615.bin
472ab253bf1f1de87161dc6de287cee0a1020b9d005ad5b7b161ad4c5f129f4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 5460 bytes
font_01_sfnt_off0000f8b0.bin
86fe1494a19b7eade4b29209063b7bf2057106e092a6f6a3a52b90688f188250		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 10272 bytes

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