Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf3dcbc68e1a77c…

MALICIOUS

PDF

110.9 KB Created: 2021-02-25 04:05:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e60c9f037a485e06633b3f091f66821a SHA-1: 9cddb6bf03dc2667c76a74d8ff66884bc3a61d81 SHA-256: acf3dcbc68e1a77c0a0e75ad0230a4077665d88da2e33b074149abfa717ec228
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=pokemon+ash+gray+walkthrough+squirtle+squad PDF link annotation
    • https://cdn.sqhk.co/bitaxukezor/jSSLjih/kung_fu_fight_scenes_best.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425255/normal_5fd6aef2a79d0.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/20058489546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446776/normal_60293da75296d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466154/normal_5ffd7ca61acb2.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/jidljj7/zobopurebaxotodup.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/nyc_live_subway_map_app.pdfIn PDF document text
    • http://serdyukov.pro/kekoxuwqzg.pdfIn PDF document text
    • https://cdn.sqhk.co/xejoxoka/gLicidO/jejabamep.pdfIn PDF document text
    • http://todayit.pro/my_little_princess_2011_full_movie_englishyjam5.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/film_review_essay_sample.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/cjjCU25/labamaruwotavimalavi.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/36172641803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413007/normal_600a4815d4166.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/fomudebipefasu/redacted_mueller_report_released.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/publication_15_employer_s_tax_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/jivurijona.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/minecraft_pc_free_1._15.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_off000173c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173C5 5624 bytes
SHA-256: ba5653a03927a9d8d70b7849bad8838d624e1abedfa92c98b148bae5e0e8b815
font_01_sfnt_off000186cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186CC 11708 bytes
SHA-256: a7943594c529a57e10088c37f205c0123d82c132730cef8a97536e9207055ee5

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