Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc15c9d10a7edb3…

MALICIOUS

PDF

78.4 KB Created: 2021-02-09 20:06:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 948b3ef25f8475110b96850b40021aa7 SHA-1: 79e723370a3aa9289fb3305c7d187e41353d3387 SHA-256: bcc15c9d10a7edb314e70298476185a2bbef9e14cfc51250f4d92274b3122691
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to a known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of numerous obfuscated links suggests an attempt to direct users to potentially harmful content.

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/123?utm_term=el+burlador+de+sevilla+resumen+jornada+3 In PDF document text
    • https://cdn.sqhk.co/vetedaxuzele/Ffibugd/baduxudomubodub.pdfIn PDF document text
    • http://idealica-italiaoficial.site/origami_paper_crane_stepsuiaum.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/gfijTIB/fifa_soccer_13_ppsspp.pdfIn PDF document text
    • http://slimitalia.space/mosula7v560.pdfIn PDF document text
    • http://cashthe.ru/60_day_notice_letter_templatek9mfg.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/ias0Jjf/xesadiluzip.pdfIn PDF document text
    • https://cdn.sqhk.co/fexilejedit/sdidihx/26133632503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488837/normal_6017010e20d47.pdfIn PDF document text
    • http://sport-stavki.fun/cyperaceae_family6feap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383314/normal_5ff692a5a55a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488566/normal_6021fa10d3bc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393754/normal_6013295a030f5.pdfIn PDF document text
    • http://solent.bar/black_desert_online_musa_gear_guidermj0h.pdfIn PDF document text
    • http://solapp.xyz/avital_ronell_the_telephone_bookbjrlg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467306/normal_5ff1eb22b2ba8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471509/normal_5fe1ab9a5be7e.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/luropiw/boomer_sooner_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/24358365579.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/previous_employment_verification_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/51741021255.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_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 5368 bytes
SHA-256: 4c61b6a51433bf6c5ea90b8b03060fea5f0e5e834ade735e5bd13b20e74fa807
font_01_sfnt_off00010669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 10996 bytes
SHA-256: 0e61fe31d8d0b4698291f1d8f62ac4f52abdd7dcf27501d0c981cd7f1f584c92

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