Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbdf7061ea35df2…

MALICIOUS

PDF

84.8 KB Created: 2021-04-08 09:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1bc434dc9c058ea440159fafa686e7d7 SHA-1: 04f49338d3e5f74c92627079e7fdde1b478ac5f7 SHA-256: abbdf7061ea35df2b145896ee176b06e5ca6b1288cda9b4de9e4ff8ea406afa0
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text that appears to be a search query, likely a lure to disguise the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=who+wrote+the+song+good+golly+miss+molly In PDF document text
    • https://cdn-cms.f-static.net/uploads/4455886/normal_6052232f34f44.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopivosoba/FRhhiij/geburomavegopud.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/hjeggKe/ramup.pdfIn PDF document text
    • http://itravelgr.com/voxoxozegebaze2ngjd.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/NYhh0gi/pregnancy_simulator_game_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393019/normal_60287c3262e98.pdfIn PDF document text
    • http://amsidisi.xyz/sharp_12_digit_printing_calculator_how_to_useqrdh3.pdfIn PDF document text
    • http://hidver.com/fipuzawogotusenis7hih.pdfIn PDF document text
    • http://cybety.xyz/the_well_educated_mind_barnes_and_noblex5x2l.pdfIn PDF document text
    • http://gonzo-3d.com/schematic_design_guidelinesaigwv.pdfIn PDF document text
    • https://cdn.sqhk.co/kabutijefix/Unnd72x/download_game_robot_shark_cheat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/58ef75fa-a97b-4537-a6a4-b64a63175cd5/sonijiwujolim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a919dade-1486-403a-adea-c360a15e4476/siruzofavujow.pdfIn PDF document text
    • http://wosolebaxuwutux.rf.gd/bilateral_lentiform_nucleus_calcification.pdfIn PDF document text
    • http://wufujipiramuz.rf.gd/despues_del_liberalismo_immanuel_wallerstein.pdfIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_b1bedd6bac764f4286d24da00a10025d.pdf?index=trueIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_54eeff35382c4f869c3ec0016bbe212a.pdf?index=trueIn PDF document text
    • http://saditufawixak.rf.gd/jebepamuto.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_off00010e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8D 5236 bytes
SHA-256: 64dd27ff59a2b4d337fe9321feb384c9eb2782d3043601e20177be54da14a89f
font_01_sfnt_off00012051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12051 11020 bytes
SHA-256: b64eccdcd7df07f15397932885176a4ae9de49f9b6bcefaf8ef3abe7c2ef5b5f

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