Malicious PDF — malware analysis report

Static analysis result for SHA-256 227949854e9f3e8e…

MALICIOUS

PDF

75.4 KB Created: 2021-04-01 16:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ec8bd8c9ae7aed3634872a6cbf6d252f SHA-1: 9ae59e1785b488dc63982d068885d43111fc11ec SHA-256: 227949854e9f3e8ec8a42f30ca451fd189a5cbcacf3eb2e34d5ff46a61a0d002
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 0.9997

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://gimoguvi.ru/award?keyword=fantasy+art+techniques+boris+vallejo+pdf PDF link annotation
    • http://123dutch.com/the_spare_room_helen_garner_book_reviewen8yr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445557/normal_604751810a217.pdfIn PDF document text
    • http://midimox.getenjoyment.net/importance_of_civic_engagement.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464313/normal_60464c6e443bb.pdfIn PDF document text
    • http://zuxemesemubozo.mywebcommunity.org/shakespeare_sonnet_16.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/photoshop_cs5_step_by_step_tutorial_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385614/normal_602e735879b39.pdfIn PDF document text
    • http://on24-system.club/assamese_song_zubeen_garg_2014nwfsf.pdfIn PDF document text
    • http://zezasarasojid.mywebcommunity.org/gasification_of_coal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447914/normal_6033a0aa43ce6.pdfIn PDF document text
    • http://soinjaga.ru/centurylink_actiontec_c1000a_default_password3r4sz.pdfIn PDF document text
    • http://terakusinuw.mypressonline.com/36207283927.pdfIn PDF document text
    • http://24goodstore.site/wifarokabajonekidag5ucjr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424981/normal_5feb1bfb1fa86.pdfIn PDF document text
    • http://mastericy-chistoty.ru/behold_a_pale_horse_full45tme.pdfIn PDF document text
    • http://lilozekakotelup.sportsontheweb.net/adverb_of_frequency_examples.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_d17960605e844adab1adca7453341274.pdf?index=trueIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_505adc67cd8a44f7a6bacc8ae9f3ff65.pdf?index=trueIn PDF document text
    • http://xiwexuxe.atwebpages.com/rexawasukasu.pdfIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_69c176a31a0e4536a5a1e1e7d87b759a.pdf?index=trueIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_0b130381593d42cfa29c620e5f780e4b.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_off0000e645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE645 5704 bytes
SHA-256: d7ff097f9009d359f5c29aff9bd12e3d9f3e96d60c50016a3fd37077c2061bd1
font_01_sfnt_off0000f9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B2 11648 bytes
SHA-256: 10ad5ca9e9b6fa2c7afdd543018a61ffd75ac531192940c563778d536c6cae23

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