Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b5db8fce4b58b9…

MALICIOUS

PDF

79.5 KB Created: 2021-05-10 05:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1a70b4b16f7882e92932df149731d683 SHA-1: e1c33157b61fcd015d8dc9f65de44fd3d7f49c56 SHA-256: d6b5db8fce4b58b98189782de480aeff6fb5387f8d8460fdb18516de3f723be1
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to redirectors and disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dafemum.ru/strik?utm_term=yard+machine+riding+mower+steering+parts In PDF document text
    • https://cdn.sqhk.co/peposusuwi/cgjzdij/bodukipeluzepifolevuludeg.pdfIn PDF document text
    • http://milky-rp.space/xavuvogojufj8ii.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/gifjcjj/37286073982.pdfIn PDF document text
    • http://biweekamnf.com/12210320446t7npq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476432/normal_6047224940610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501206/normal_604b0ffed89d6.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467577/normal_5fc60bc390d5d.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/AzRhdhd/bounce_tales_original_apk_download_for_jio_phone.pdfIn PDF document text
    • http://magic-spring.com/samrat_ashoka_tamil_movie_songsw1e0o.pdfIn PDF document text
    • http://bigops.fun/degas99p5y.pdfIn PDF document text
    • https://cdn.sqhk.co/buruvalufe/f5NhOjd/gagazudefiwepupirelamipoj.pdfIn PDF document text
    • http://sallely.xyz/72497089785s8ne9.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/ieiWOjj/81367312461.pdfIn PDF document text
    • https://cdn.sqhk.co/romekeka/ghaRXjd/roland_boss_rc-_505_loop_station.pdfIn PDF document text
    • http://natur-bio.space/19025279519y093c.pdfIn PDF document text
    • http://fenellalucynelle.info/46559561787eby63.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/Vhaifge/17137223166.pdfIn PDF document text
    • http://italysummer.space/how_to_paint_a_tree_leaveslquer.pdfIn PDF document text
    • http://myyshooop224.site/deal_of_the_day_amazon_ukam96g.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/gcgdJha/91250384769.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vazisi/59025075705.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/happy_belated_birthday_song.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_off0000f9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 5508 bytes
SHA-256: 8f695ad0ca49cc5816c38007c1a864c002043b69e82c7b5fef3570cbff3a1848
font_01_sfnt_off00010c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 10616 bytes
SHA-256: 4c4ecc8dd086284bdb338565978acaa1139a7f384569a3bfc53e9fb12772eaa7

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