Malicious PDF — malware analysis report

Static analysis result for SHA-256 67bd3e1319776f76…

MALICIOUS

PDF

68.8 KB Created: 2021-02-26 06:53:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a59ce0e4e132707d83915fa6104cc4a0 SHA-1: dbbad64d9133131c8bd9e559d62577d7ac9d3926 SHA-256: 67bd3e1319776f767462867db7a2464e12bd35a54deaf1fe447bb1f5f92347a6
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical finding for a link to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of these links and the overall structure strongly indicate an attempt to redirect users to malicious sites for further exploitation.

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/wix?keyword=vocabulary+workshop+answers+level+h In PDF document text
    • http://beach-fruit.fun/6818189042rugn8.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/what_are_the_five_basic_steps_of_psychological_first_aid.pdfIn PDF document text
    • http://4kuhd.me/jawbone_big_jambox_manual_reset2044m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483851/normal_5fd3cd7150feb.pdfIn PDF document text
    • http://glav.info/tenant_lease_agreement_template_south_africabmlx1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483331/normal_60384df311fff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389097/normal_60115130bda57.pdfIn PDF document text
    • http://justiciaforjustice.com/rudiluwewujeh40lt.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/12913702234.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417534/normal_600341c7ee90f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381104/normal_60368c6229636.pdfIn PDF document text
    • http://dalidusiz.mywebcommunity.org/34219549133.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465685/normal_6001bd46ceb9f.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/22530498234.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485822/normal_5ff625d6d2e9c.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/pasawe/83823290871.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/50326482388.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/kibuvajugovos.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_off0000cf0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0E 5444 bytes
SHA-256: aaca094906d4f91c904937fdb5ca318e9af50650f01aceda38731295989365a3
font_01_sfnt_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 10248 bytes
SHA-256: f648c43b6ff2204eb1c23941e52c939c129a2db04bb4ef91605193a633b7d583

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