Malicious PDF — malware analysis report

Static analysis result for SHA-256 f611ca87bed4006f…

MALICIOUS

PDF

87.7 KB Created: 2021-04-09 03:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2136b618624c7a1f793cba1c31ccdb85 SHA-1: 9d82e92c74e3cfe87c680fb1299d4be8cde40b2b SHA-256: f611ca87bed4006f4c44886f6fcd4e907a55ab7fdd3f28dc7d0fcfb06bce2977
244 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs suggest the primary purpose is to lure victims to external sites, likely for phishing or further exploitation. The presence of numerous links, including one pointing to a known malicious redirector, indicates a broad attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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 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.
  • 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=yamaha+djx+iib+dj+box In PDF document text
    • http://supobesopo.mygamesonline.org/koxuwefominodexame.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwagezo/iebOihr/minions_movie_series.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/PFViccw/samsung_level_u_2_neckband_bluetooth.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/iiiohhc/81347119877.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/menasotizibon.pdfIn PDF document text
    • http://xuroriwonufuz.scienceontheweb.net/employee_letter_sample.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_66a92db13d4440dd91f12143469be0f9.pdf?index=trueIn PDF document text
    • http://tuwutexo.onlinewebshop.net/36350299407.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/personal_branding.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_d6f78209e0ec45858cece35d3a579c2a.pdf?index=trueIn PDF document text
    • http://jewofeket.onlinewebshop.net/cancer_de_pulmon_escamoso.pdfIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_b1df9bc5ca5c4e62ba84b2759ff8c047.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/nupinisonarazamenix.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/73950960459.pdfIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_4826eec0e0414d45aebb93d29a49cc8a.pdf?index=trueIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_075cad021ee849f0934f262d90de2d3f.pdf?index=trueIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_07e82e2f868c4eb6b4e28f51ab429ac5.pdf?index=trueIn PDF document text
    • http://wawikoduvebakap.onlinewebshop.net/15068644052.pdfIn PDF document text
    • https://35ee410b-845d-4d62-be17-37d15bc3946c.filesusr.com/ugd/e5a943_d73ef95b99454cdfa4ffe91caa98da37.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nagudo/xivija.pdfIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_3b15627d48004a07b10d5e26576bdf29.pdf?index=trueIn PDF document text
    • https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_789682a8bb434e18b420721b55c8daed.pdf?index=trueIn 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_off000117ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AD 5004 bytes
SHA-256: 3f11459e7c3852d515b41bd2ce4d4cdc238f7af431f0ae12db9bbbfec6db25b9
font_01_sfnt_off00012897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12897 13124 bytes
SHA-256: 5b647be217cc75d814ec1fe24f2d10cbc1a9515a423ff9b96caee441366e631f

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