Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83d851671ed9b1e…

MALICIOUS

PDF

75.9 KB Created: 2021-03-04 00:51:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 75145dc6cb8405d0bd19dc9c59890445 SHA-1: 841517a04ace61abfb54d7d2e81401162a53db1b SHA-256: c83d851671ed9b1eb293c8996884b3bffe7c1dbae23ab614fd5214fe3bb7d077
192 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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=graco+nautilus+65+manual+portugues In PDF document text
    • https://cdn-cms.f-static.net/uploads/4500679/normal_601e43c0cf9d4.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/fQhjijb/62890122707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_60132994392c9.pdfIn PDF document text
    • http://help-nanny.site/98675419813vo5gb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427076/normal_5fdf2fb6838e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501383/normal_601ba6abd46c1.pdfIn PDF document text
    • https://cdn.sqhk.co/gapevusa/GFzH3he/kilelodowivide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_600cbc812487d.pdfIn PDF document text
    • http://hookup153.online/samumotmqqk.pdfIn PDF document text
    • http://herss.space/how_to_tell_the_difference_between_categorical_and_numerical_dataim6ey.pdfIn PDF document text
    • http://theraisins.pro/66302893717ugmdt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471941/normal_600808c4b419c.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/uSqyheU/19568403767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421214/normal_6018d8af6d30c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486535/normal_5ffcb77edfae7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474169/normal_5fcc1caa14a2f.pdfIn PDF document text
    • http://top-shop-store.website/greatest_rock_songs_of_all_time_youtubebnqix.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/hjXupWu/dialogue_synonyme_francais.pdfIn PDF document text
    • http://finansi-7.online/jurnal_keperawatan_hiv_aidsp2yg8.pdfIn PDF document text
    • http://goldotzyv.ru/lamborghini_song_whatsapp_status0n8qg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fazetotunoju.epizy.com/arduino_uno_r3_programming_tutorial.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_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 5564 bytes
SHA-256: bfd84928c838681033c37e8dbddf9a1ef7563507f35b98a9a97f9cdc872bf132
font_01_sfnt_off0000fdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 10544 bytes
SHA-256: 6d0004e04ef707930bd663cd3e38a67df8d6acbffa7756346a8c892f358461c8

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