Malicious PDF — malware analysis report

Static analysis result for SHA-256 452f53513977a586…

MALICIOUS

PDF

84.0 KB Created: 2021-03-26 08:05:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fad89d2d2dd238b724523d904be3b83 SHA-1: 592a5ffda0ba08e6de456b69512aff94f5bb8b4b SHA-256: 452f53513977a58609adbf8ce00b474df6b15c9b396c762d55d9d67d890cf0a3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it's designed to redirect users to malicious content, likely for phishing or malware distribution.

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://leonvi.ru/wix?keyword=adventurer%2527s+guide+to+the+sword+coast+pdf
    • https://kovuvewu.weebly.com/uploads/1/3/2/6/132695697/tamivilivapowod.pdf
    • https://podogavefa.weebly.com/uploads/1/3/1/4/131438056/28befc5.pdf
    • http://fruktovik.com/chichora_full_hd_movie_filmywap1xbn4.pdf
    • http://mifopevoruroga.22web.org/85086562044.pdf
    • http://dashcamtopbest.com/kuvir1fsr6.pdf
    • http://lg-copyrightforms.com/i_love_my_lover_book_quotesuemn0.pdf
    • http://bonusiotsbera.online/kazomokigujokowexafiknbmje.pdf
    • https://vesevowix.weebly.com/uploads/1/3/3/9/133987154/vobuxagiluposir.pdf
    • http://deemonatrafik.xyz/45555796011rseef.pdf
    • http://vanolusivibemot.iblogger.org/quantitative_aptitude_questions_with_answers_for_cat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nadurajamewe.epizy.com/android_color_parsecolor.pdf
    • https://uploads.strikinglycdn.com/files/09600a54-2740-4d3d-a07a-18a4d3067555/gutazijulotudonomigaz.pdf
    • https://uploads.strikinglycdn.com/files/708a8a24-e15e-4dc3-9055-545a6acf17c6/funikasirupetifigazudij.pdf
    • https://uploads.strikinglycdn.com/files/81df6f84-84fb-448d-a7fa-6ab07f04c705/nulazefabap.pdf
    • http://ruzoguniwu.epizy.com/dovubirinizimelotakadex.pdf
    • https://uploads.strikinglycdn.com/files/ded6f46e-3f7d-4ec0-8781-6063d9c777cf/battery_tender_charger_manual.pdf
    • https://uploads.strikinglycdn.com/files/588e8dd9-da86-4aae-b711-1bc9aa5ed600/sesixoladazusabotu.pdf
    • http://dikuwunoxoxa.epizy.com/toditenivas.pdf
    • https://uploads.strikinglycdn.com/files/ef3131c6-89b2-4865-958a-caad1f19072c/best_air_purifier_with_uv_light_2020.pdf
    • https://uploads.strikinglycdn.com/files/cb1455d8-1484-4102-b2dc-bc7d4d6e0360/college_algebra_formulas_sheet.pdf
    • https://uploads.strikinglycdn.com/files/60519ed8-2d91-4a04-9170-cddf261de386/how_many_articles_in_russian_constitution.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f796.bin
23822c39e7f1c0a07736acbaa29e9171e06e8e44e1fadf454a6729a455c9a614		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 5440 bytes
font_01_sfnt_off00010a2c.bin
9a9442c083077bf313a98a470e2588da2ddbcf9a0edd867a46a29894039355dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 12656 bytes
font_02_sfnt_off000133de.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133DE 4324 bytes

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