Malicious PDF — malware analysis report

Static analysis result for SHA-256 256bb2bee1b60cd0…

MALICIOUS

PDF

72.6 KB Created: 2021-03-21 00:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2c3c493cc04783f71355abd8074c781b SHA-1: e4eec4359f6159b5a15a1a13a9c16225b6f9fbf5 SHA-256: 256bb2bee1b60cd0bafd68cb3b17f372cd636d0b2087889b59fe6afdfbf61edd
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious domains, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains fragments suggesting a technical pretext, such as 'Android remote bind service example'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=android+remote+bind+service+example In PDF document text
    • http://mmuuue.space/movies_near_me_open_christmas_daygzsvm.pdfIn PDF document text
    • http://ledy66.net/resume_menon_platono52tq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456379/normal_5fdb2861960de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443325/normal_6009d0d5ed57f.pdfIn PDF document text
    • http://wevepizivato.22web.org/daradafelemapotun.pdfIn PDF document text
    • http://vimatineluxux.22web.org/how_much_do_crime_investigators_make_an_hour.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422659/normal_6040db48ccfc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501810/normal_602678da64362.pdfIn PDF document text
    • http://bepevekebezupu.22web.org/dell_xps_8300_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/vopovaroxamo/MeKxfha/migiv.pdfIn PDF document text
    • http://affilateapp.online/xscape_off_the_hook_torrent5d7f6.pdfIn PDF document text
    • https://cdn.sqhk.co/menaleratupo/gjjuXTX/bunademoxidevuwowadujure.pdfIn PDF document text
    • http://white-x.fun/delta_20_band_saw_tirestumy6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423696/normal_6052ecdc72dde.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://ximigatoma.rf.gd/but_although_however_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/redox_titration_lab_report_theory.pdfIn PDF document text
    • http://daxepusiz.rf.gd/logstash_elasticsearch_template_overwrite.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/what_was_the_result_of_pinckneys_treaty_with_spain.pdfIn PDF document text
    • http://tezipibuboxigo.epizy.com/17165041339.pdfIn PDF document text
    • http://wogafut.rf.gd/operating_systems_concepts_10th.pdfIn PDF document text
    • http://vusebajawibapun.rf.gd/56718538639.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_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 5264 bytes
SHA-256: 5c75f7943d19490591d68e8919e70a0748ab358a11020e74d37542cde3a3481e
font_01_sfnt_off0000e149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE149 10900 bytes
SHA-256: eb92b03427c7c542cc98d56fe0337138cd05c2a9aded05eef11873aee8999404
font_02_sfnt_off000106a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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