Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a018df9156c869…

MALICIOUS

PDF

73.7 KB Created: 2021-04-16 04:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 61a9daba42b6f55fc11a2d4a9be3c9e9 SHA-1: a2c4817cc9cffb8d30d4f4302de907c601efe769 SHA-256: f3a018df9156c86903c6b1c8fdb0b89476256563da3c5ba68c7aad133ead54df
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and configured as link farms, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'free download', reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/strik?utm_term=dama+dmbok+pdf+free+download PDF link annotation
    • http://drilltech.info/zewenonefoxikhgrba.pdfIn PDF document text
    • http://magic-spring.com/brother_mfc_7360n_driver_free_downloadsgrlu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407084/normal_5ff30b408e476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495395/normal_60160aa075455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412164/normal_60179efb6ee1d.pdfIn PDF document text
    • http://petrol-v-pol-price.site/samatafakinalulevuwozoz1qdxa.pdfIn PDF document text
    • http://pochta-24.cc/miracle_morning_book_in_hindi_language_free_downloadv5qtx.pdfIn PDF document text
    • http://immorta-cross1.club/accouchement_dystocique_memoire3mk59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495975/normal_6027989dc7c43.pdfIn PDF document text
    • https://migivijebejod.weebly.com/uploads/1/3/4/0/134017877/febal-kevexir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427091/normal_6049b0d008bb1.pdfIn PDF document text
    • http://tipografiyav.moscow/timeliwagorilusibv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385633/normal_5ff8994ce4b84.pdfIn PDF document text
    • http://on-arenas.com/escape_room_mystery_word_level_118_answeroomr8.pdfIn PDF document text
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/2058290.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://turagax.rf.gd/the_easy_way_to_stop_drinking_kindle.pdfIn PDF document text
    • http://bibijovefuvak.epizy.com/financial_statements_a_step-by-step_guide_to_understanding_and_creating_financial_reports.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8C 4964 bytes
SHA-256: 3a2ab55a89d424ff457970447c5a91b48b8b082ca61f230dbe414bcc07e68ed7
font_01_sfnt_off0000de64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE64 14348 bytes
SHA-256: 1cbae761c76a92861bebfafcaddbee5451db4a97b4755a45b8d930a0ef8e8fbe
font_02_sfnt_off00010bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBD 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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