Malicious PDF — malware analysis report

Static analysis result for SHA-256 b268abda189a5e8e…

MALICIOUS

PDF

77.2 KB Created: 2021-03-27 21:33:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bb54e6bc393cbf5c956e17f9f740f7a1 SHA-1: 126f6dcf9cf8cf356b9d1ab08ba7bf17342bdef2 SHA-256: b268abda189a5e8eb1928fa158999950b86d8dc44902b6c5c0bcad3b78c8fe1c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=seventh+chords+piano+pdf PDF link annotation
    • http://ruvogodozipabiv.scienceontheweb.net/what_is_a_seasonality.pdfIn PDF document text
    • http://pogibofabut.getenjoyment.net/tilujufapiwi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451376/normal_5fe5a15ece215.pdfIn PDF document text
    • http://femonejigajape.mywebcommunity.org/vejedile.pdfIn PDF document text
    • http://sutovuresas.mygamesonline.org/lazuregipaxuruwopufiwil.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/earth_abides_book_review.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/loponu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484820/normal_60367e7739f54.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/dizogebu.pdfIn PDF document text
    • http://mavogevuz.getenjoyment.net/55449616847.pdfIn PDF document text
    • http://ligugiban.scienceontheweb.net/wasexuzusaxitu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_60550e3cdc6f4b7099b0594056f31702.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_26ad7e19964f4b7a8cd022abd6d7a473.pdf?index=trueIn PDF document text
    • https://620678a0-8f5b-407b-881a-8a96a128c1c4.filesusr.com/ugd/25b7a6_6f5801c6305e44bdbbc9c9e9e5ad09fc.pdf?index=trueIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_c4beaf4e1a07433da24f99e9548020cc.pdf?index=trueIn PDF document text
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_b57026c2984840279ada9f2a92d15901.pdf?index=trueIn 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_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 5372 bytes
SHA-256: 6d95a533fd08aeb92128c31967b285853df05fafb70bd4c573c8331f7a5ab545
font_01_sfnt_off000102cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CD 11132 bytes
SHA-256: e12eaf9926addb0afef5086086dd59ab32654638f28c99aa52c75312cb26f4ca

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