Malicious PDF — malware analysis report

Static analysis result for SHA-256 552a19fd33935cec…

MALICIOUS

PDF

76.2 KB Created: 2021-03-21 02:49:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76cdcd1fb19dc47b2a96584013d17c84 SHA-1: 213bea0834da1642827cc9d15f0205d470a87729 SHA-256: 552a19fd33935cec3e2797b08785c434b4e29a49664895544aeef4c5ee07f21c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially harmful content.

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-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://vilenefex.ru/wix?keyword=8th+grade+physical+science+final+exam+study+guide
    • http://natlab.ru/canon_av-1_camera1xrjp.pdf
    • http://mogimetekojubar.scienceontheweb.net/94843278333.pdf
    • http://nijepatexosanus.medianewsonline.com/27780189665.pdf
    • http://bestrongbyg.com/43746977682dvxcz.pdf
    • http://reggis.info/12953172631h0vus.pdf
    • http://ionatr.fun/14224167303dpz93.pdf
    • http://mamuxorap.getenjoyment.net/bhagavad_gita_download_in_english.pdf
    • http://idealica-it.website/kicker_kq5_manual70r96.pdf
    • http://mantenancie.com/why_was_fredo_killed_in_godfather_2okdkl.pdf
    • http://contentmedialiteracy.com/algebra_2_downloadtcbvb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_00d4cfb07cff4893b5c13c319b03d9d9.pdf?index=true
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_a0bd3d2e8fff4ed8a12a9f6d0ee98d23.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3c24175f-67c1-4ece-aba9-2e64e16e3e9d/vifepezuj.pdf
    • https://uploads.strikinglycdn.com/files/2d515519-706d-4058-bcf4-b65d2fa746c6/super_mario_sunshine_multiplayer_mod.pdf
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_a829be81826243cb807b5458e820de62.pdf?index=true
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_6bce23d9049b46baaa192cf7e04b2bc1.pdf?index=true
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_9aa62ed4afaf4e4c94c808f0602e3ea2.pdf?index=true
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_e7a0ead51e7c45bb8e019e6be2783301.pdf?index=true
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_452ed8b718fb4df39be77a91d62156de.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_off0000eacc.bin
53d92976e17ecac9d01be018b96b018bb6f9123e2b325078b779121d0292f219		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 5836 bytes
font_01_sfnt_off0000fe92.bin
f531f1557d136dae2e255a1c3caa16c7ffde2023ab53a84161725eb01536e1b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 10744 bytes

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