Malicious PDF — malware analysis report

Static analysis result for SHA-256 376693f7da04fea8…

MALICIOUS

PDF

72.8 KB Created: 2021-03-11 21:51:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 73139e96dcc8f88132ab9f133cc664e3 SHA-1: 15acda48083c6dcdefd6fcb19946a3f88e1578d6 SHA-256: 376693f7da04fea80ef80ffe7c3daa69b53c8a73eb41dec59d0407988b3c08ca
184 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to a known malicious domain, dafemum.ru. This domain is associated with phishing and link farm tactics, suggesting an attempt to trick users into visiting malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=phone+answering+machine+with+caller+id In PDF document text
    • https://cdn.sqhk.co/midijanere/hegeic7/dexefoliv.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/SKid36i/battleline_tactical_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/podidiwi/eP505gf/30955255926.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/ifhhjan/puxitojuzeji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_56fcad8f64bf4b1594ab3413f6e7ead0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/nowududawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f8984fb-ff4d-43d8-b41e-9f2dacbaf7a8/34763284108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03429a9a-315c-4816-9dcf-d9f5b1cce30f/49322707813.pdfIn PDF document text
    • https://9a9c460d-1cca-40b0-aaa8-67a875e606f2.filesusr.com/ugd/3b0c81_0017a04d46d94924b56cf8e37e71bb96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/os_capites_de_areia.pdfIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_759bb6653d444a7d920aae55017930d6.pdf?index=trueIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_5b1ab6d9794f490fa948e2a3b7a7db22.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be6af73-da08-4e5c-9d46-ab22e42b3fc3/my_pioneer_radio_says_memory_full.pdfIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_cd8bb1d0ac5e442ea76d6663d52c9142.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/minor_electrical_installation_works_certificate_template.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_off0000dffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFB 5448 bytes
SHA-256: f39e97f5971abd7c687c3b2fd9bfa52c6c1d5c01b0102b62cdbd32584d67716f
font_01_sfnt_off0000f266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 10448 bytes
SHA-256: 98545b7e928f023202a2ac2657e6b827b9fecbe78ca31384b7a18c83838e9e96

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