Malicious PDF — malware analysis report

Static analysis result for SHA-256 a864be23d5d602ce…

MALICIOUS

PDF

77.9 KB Created: 2021-03-29 11:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cf3c1d5cc82ab50d3f2da0fa118466bc SHA-1: 10c45ca3ae085a2a8fe7005ad122ba2e217d82f4 SHA-256: a864be23d5d602ce2bc3e9d3310a38643c872dc74b58fc9119b448eca059c165
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to disposable hosting, indicating a link farm for SEO manipulation or redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://maypoin.ru/award?keyword=pdf+reader+annotate+mac PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374857/normal_5ff2136c96f87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459623/normal_6006cc990bce0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488137/normal_5ff05b511a955.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452217/normal_5fed8e9290d4e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_e0ea1429d41c4c2ca3b4df3275ee9d4d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55710110-f138-4794-a7eb-9f2015cd8723/dominos_pizza_garlic_dipping_sauce_recipe.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/gipifonurir.pdfIn PDF document text
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_70f5476758b7426784646a1172bce0b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e3fe162-b471-45cc-b508-9efd65e93707/hamilton_beach_sure-crisp_air_fryer_toaster_oven_31523_c_reviews.pdfIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_5f8ffed6658f45098fdc084bb9e518e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d60b1cb-b5ba-444b-944d-0ca2ec7e719a/zigirejibopiki.pdfIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_3e127af0ec474e21a3234bcb929bb4a7.pdf?index=trueIn PDF document text
    • http://xiramubete.rf.gd/xuvozunebimavudigiriwi.pdfIn PDF document text
    • http://kuwixogup.rf.gd/pijoruxuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eedc3b5d-6820-4ce5-8c59-4efc67745f84/vutojotif.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/how_do_i_set_up_caller_id_on_my_panasonic_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/krups_ice_cream_maker_recipe_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27606e5f-1ec8-4e3e-b8c5-ec46dea6639d/2431221484.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_0d1211cf48c94d4e850563e1681e522b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1967108d-55fc-4c86-bd6f-6d0dede1fbd8/the_lottery_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/brave_browser_tor_android.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 4960 bytes
SHA-256: 26db175062049e80044e977a2a289359a5ea879dcb6094a53e02c1fe4fe63cd9
font_01_sfnt_off000104d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D8 10912 bytes
SHA-256: 36efdffa38406d390c2cbeb817057b26a67a105cb8d4ec45aec5ad7a7c97ddbd