Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cee2a312e4697d1…

MALICIOUS

PDF

80.9 KB Created: 2021-03-17 12:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2c9ec03549f849619d6547035ab86e95 SHA-1: 2a4f4445f2c0d39509609326303a48eb180b68a1 SHA-256: 9cee2a312e4697d16f6e41fc5731b8e810c770ae9aa110c6accd9f4381fcce2e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://nipisod.ru/123?utm_term=c+stringbuilder+vs+string.+format PDF link annotation
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/f6e3bf5efd.pdfIn PDF document text
    • https://kofuwirobunugob.weebly.com/uploads/1/3/4/3/134318534/megawifuzili_zugolalipewugo.pdfIn PDF document text
    • https://cdn.sqhk.co/xasurila/GghXDjf/26659415887.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/V63hhhe/peppa_pig_my_birthday_party_dvd_cover.pdfIn PDF document text
    • https://lumozumaxovoj.weebly.com/uploads/1/3/5/3/135348549/3efe90c5649e8.pdfIn PDF document text
    • https://cdn.sqhk.co/sobilowibid/licLiah/background_remover_photoshop_plugin.pdfIn PDF document text
    • https://rozutawupev.weebly.com/uploads/1/3/2/6/132695629/nisewokenizonoguvon.pdfIn PDF document text
    • https://romuxejis.weebly.com/uploads/1/3/4/8/134887308/6216945.pdfIn PDF document text
    • https://cdn.sqhk.co/suzironanes/jbgshbq/fixuvepuvow.pdfIn PDF document text
    • http://wozupabalaviv.medianewsonline.com/96828075337.pdfIn PDF document text
    • http://risumeboze.getenjoyment.net/what_3_rivers_merge_in_pittsburgh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rususekobijo.myartsonline.com/35949955050.pdfIn PDF document text
    • http://wopojofa.atwebpages.com/wixirimesuguno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb25a44f-d955-46ea-8949-735beca82f2f/katilezaxidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe79f4ab-19c8-4409-aa30-422d6e030382/84965792442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62d2d938-f41c-4cfa-9122-5ea17dd28b0d/pasinaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/636ba950-16a5-45e9-ab95-13f2fbedbd07/liftmaster_professional_1_2_hp_remote.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/37805225619.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_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 5364 bytes
SHA-256: b99b0b91e771722db5453109165fb82afed03f9f4deea2a71beeafaf35849060
font_01_sfnt_off00010e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 11552 bytes
SHA-256: 3880e2a9a61df47ca429b9a82b0c0ab3c3fb1c3457ae3bf998f7b36485017792

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