Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e7e1b66f8d0c15…

MALICIOUS

PDF

82.0 KB Created: 2021-05-01 04:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0e6c2f774ea05a7d80113209b6f3b3b5 SHA-1: 4b422580878fa33862ede29cd46dbb3d169aec2e SHA-256: a7e7e1b66f8d0c157a6e865d5105feb69eb269327f0dcbb000713567be192abb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, with several heuristics indicating malicious redirector links and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to phish or redirect users to malware. The document body is heavily obfuscated and appears to contain junk data, further supporting a malicious purpose.

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/strik?utm_term=schwarzkopf+hair+color+chart+red In PDF document text
    • http://dakekunagefasak.sportsontheweb.net/xetewumajanawudeji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485153/normal_603aa346f24de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402294/normal_5fd97b650b322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_604a4ff0c3da9.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/change_management_competency_examples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410717/normal_5fdb92327c041.pdfIn PDF document text
    • http://mestorating.ru/796201790454nyr9.pdfIn PDF document text
    • http://wdd13.ru/fairy_tail_197_vostfrou4ks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456398/normal_604cfaaf10e64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_60158e8f676d2.pdfIn PDF document text
    • http://jisipajimeleja.22web.org/70017406739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_603873ca71248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496374/normal_604ed27ebfea0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452861/normal_603e7b72dd7da.pdfIn PDF document text
    • http://devivitonewe.sportsontheweb.net/potumimupovireninuresotul.pdfIn PDF document text
    • http://bit-ipo.ru/what_is_a_fascial_stretch_therapistt1t37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ninefaniki.rf.gd/bd_army_job_circular_2020.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_off0000f53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 5056 bytes
SHA-256: 4c46f6685fb93a8ecfa974c3a43e125a1fb8a4ba6a482b1dceac959d94576f92
font_01_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 11268 bytes
SHA-256: 650fb2189c2abcbf7e88492a4d4f5c983da1b2959b9a4ae45b477db1bcf444bb
font_02_sfnt_off00012cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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