Malicious PDF — malware analysis report

Static analysis result for SHA-256 76fa731db17dfa08…

MALICIOUS

PDF

81.1 KB Created: 2021-04-15 03:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 248583d29d31b93a3ce5a085999344c9 SHA-1: 9142517b508b6793c374c35589804345fb744c86 SHA-256: 76fa731db17dfa084898662267246c1945afb615511bffd4a77da6be8c1257a4
186 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to external websites, with one primary URL being suspicious. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack to drive traffic to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=tokyo+ghoul+re+season+2+episode+summary PDF link annotation
    • https://cdn.sqhk.co/zixapegof/ijfFiiA/don_t_touch_my_phone_wallpaper_3d_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/iibd4gg/date_format_pipe_angular_7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_255100e2de87491690362234511bb03c.pdf?index=trueIn PDF document text
    • https://331e17ce-4321-42a7-89aa-067eaa3daeeb.filesusr.com/ugd/6576ad_828c8f2e2255498487265187a4d631c3.pdf?index=trueIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_12e97d47e7204511825fab29042ec588.pdf?index=trueIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_d2a4de38ba564cd7a62d3118bbcbfe32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/13403985075.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_a0a31a7452ed4d2a8ec4dffb4dadefb6.pdf?index=trueIn PDF document text
    • https://619c993e-e215-4b07-891b-88776ecab8c8.filesusr.com/ugd/1fce43_4057fd7d16844caaabde5ef7c718a177.pdf?index=trueIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_1fd81c37b07544798ec06ec573a34fc2.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_921d0bcf6f5649e3ac21bd20b73f926c.pdf?index=trueIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_31592351aa814572b8c6cda9efb90310.pdf?index=trueIn PDF document text
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_e57bfd0ba95046838091dae628a0b5ed.pdf?index=trueIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_053ce236b34242a290ac1e059697c704.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_ac535378bf9247948db23f2a00494eac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/37783303231.pdfIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_528b67f7498145e2b349d74756f22c34.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_e97b79ef8dbe4fcd8d5e6887f1a6e972.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/gefum.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/married_at_first_sight_2019_tv_guide.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_off0000ed52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 5160 bytes
SHA-256: e5bc4ec9da0defecf687d1f0d0f36e5a03166883d80a67cc447d14c81da6a743
font_01_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 5620 bytes
SHA-256: 70d5b71fa244137e9c48675f3c1d5f231704582ed47a8b043e01af8b9809fe51
font_02_sfnt_off0001121a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 10652 bytes
SHA-256: 4873c79563b62c72dcb39da7b72d8e947c23984501db2f06a5ca17f8936b07b0

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