Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f4a591194e2ea4…

MALICIOUS

PDF

80.7 KB Created: 2021-01-21 11:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 0ef391da2ab398dd3fb8dafd73f1b108 SHA-1: 721805940605d39f79dc2639e01e8264a120871f SHA-256: c7f4a591194e2ea47f040f51834fc95bd032c3c7c8d4194c9f91dc3d3ff06456
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with critical heuristics indicating it links to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to phish for information or deliver further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

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://crophysi.ru/aws?utm_term=transport+canada+aviation+crash+reports In PDF document text
    • https://site-1167926.mozfiles.com/files/1167926/android_tv_remote_service.pdfIn PDF document text
    • https://cdn.sqhk.co/podidiwi/MlifYjc/crazy_amazing_football_catches.pdfIn PDF document text
    • https://site-1166064.mozfiles.com/files/1166064/math_worksheets_for_1st_grade_money.pdfIn PDF document text
    • https://cdn.sqhk.co/keragipiki/s3gi3A9/boulangerie_moderne_patisserie_paris.pdfIn PDF document text
    • https://xudezilo.weebly.com/uploads/1/3/0/7/130739240/6188346.pdfIn PDF document text
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/wenebudotemuzoso.pdfIn PDF document text
    • https://vumazilizulorap.weebly.com/uploads/1/3/5/3/135300666/mulebubikisovotasage.pdfIn PDF document text
    • https://cdn.sqhk.co/vovoritufi/Jgddjfl/46432010725.pdfIn PDF document text
    • https://site-1177098.mozfiles.com/files/1177098/nsw_fire_report_application.pdfIn PDF document text
    • https://site-1168371.mozfiles.com/files/1168371/tinea_capitis_treatment_guidelines_adults.pdfIn PDF document text
    • https://site-1175088.mozfiles.com/files/1175088/soap_cutter_miter_box.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vawoginele/subuvajit.pdfIn PDF document text
    • http://kopuperoki.epizy.com/32233213873.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/nizijofedezotib.pdfIn PDF document text
    • http://wufizomofoduzin.rf.gd/vasajomiwivena.pdfIn PDF document text
    • http://siwojanapav.epizy.com/29516171524.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_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 5140 bytes
SHA-256: be7e86f3a420367867392ee3b881bad1f1cb463a45bb16dee32e5b47b6c99b96
font_01_sfnt_off00010e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E92 11888 bytes
SHA-256: b30f08cbd2f1817dd5d8736437a676cdc543aa814ae6f057291e948910374e43

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