Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad53639c5bd3cd02…

MALICIOUS

PDF

87.2 KB Created: 2021-02-15 05:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4e31a508d52d382c8408d649387a77d8 SHA-1: ac159baf7b20ec7035199df54b00ce6090ede25b SHA-256: ad53639c5bd3cd027177f91070fe0771c95b8e7bd3d9ff027d5d746275fd26c7
184 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=watch+online+movie+apk+punjabi In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416495/normal_6014900bf11e8.pdfIn PDF document text
    • https://cdn.sqhk.co/gawukale/ligjig0/xaxifamulupazof.pdfIn PDF document text
    • https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/sebinex-zakomadu-fuvug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464878/normal_5ff91195d36e1.pdfIn PDF document text
    • http://gramnews.xyz/dagiramarududuroruf0nsmi.pdfIn PDF document text
    • http://barberking.best/2982186347mmecy.pdfIn PDF document text
    • http://instapodarok.site/75223032947av66b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416939/normal_5fe6c60231342.pdfIn PDF document text
    • http://supernefritroller.xyz/hitachi_compute_blade_500_serieslvcft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_60105a106c74b.pdfIn PDF document text
    • http://pshcomonhere.xyz/wedding_crashers_2005_hindi_dubbed_300mbw1oeh.pdfIn PDF document text
    • http://pressit.space/columbus_day_worksheets_4th_gradebhuo9.pdfIn PDF document text
    • https://cdn.sqhk.co/wosepimi/tVicyih/birthday_name_song_app_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371509/normal_600656cfa1208.pdfIn PDF document text
    • https://kixixowagixu.weebly.com/uploads/1/3/2/7/132710794/2684872.pdfIn PDF document text
    • http://aycotoro6.xyz/mipulorurobesefqkye4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/newly_released_android_games_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/brendan_gregg_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D11 5132 bytes
SHA-256: 9c7741499ad772541f48f82e5d0444809f4f3bc68f4ef2382c56bd35f8b52034
font_01_sfnt_off00011e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E66 10192 bytes
SHA-256: f616aac0b0c72f76b328abf8f57112a7ac5f5a979ede7eb3c8f80cc3261a0b13
font_02_sfnt_off00014142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14142 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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