Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8ea4415c77e7a1…

MALICIOUS

PDF

117.9 KB Created: 2021-05-03 20:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8394563ec87cd07bd7d1620fb24163ee SHA-1: 706e8ad22567dd3a5a34fb46c3c448da5862a334 SHA-256: 8f8ea4415c77e7a1677879db3dfa8a9472a389d40410a91a9bdc54e12cf4058d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with many pointing to disposable hosting and employing UTM parameters, characteristic of link farms used for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://druttle.ru/strik?utm_term=how+does+velocity+affect+time PDF link annotation
    • http://leftoutclub.com/2011_honda_pilot_service_manualhqq4n.pdfIn PDF document text
    • http://arnautmebel.ru/jekebenenozolw3al.pdfIn PDF document text
    • https://cdn.sqhk.co/tafolaku/iiRbjbT/4k_gaming_wallpaper_for_iphone.pdfIn PDF document text
    • http://my-favshopf.online/85390618042lxiel.pdfIn PDF document text
    • http://rebelliona.online/sqlite_android_tutorialzgxre.pdfIn PDF document text
    • http://sexesex.site/wallpaper_hd_breakup_cartoonyiosi.pdfIn PDF document text
    • http://koolmaxt.online/13461596589h3cia.pdfIn PDF document text
    • http://afracheat5.xyz/619422517070end3.pdfIn PDF document text
    • http://raffle.website/905803590894swgg.pdfIn PDF document text
    • http://lolkek.xyz/2300850447y971t.pdfIn PDF document text
    • http://sobakin.space/lukikifolenirebgkbp9.pdfIn PDF document text
    • https://cdn.sqhk.co/kezomerameki/hfjcIje/bloody_bastard_meaning_in_marathi.pdfIn PDF document text
    • http://ultra0.space/tiludarepywkmh.pdfIn PDF document text
    • http://cetakchantek.com/the_distance_between_us_charactersn6tiq.pdfIn PDF document text
    • http://ledimpress.biz/what_was_the_purpose_of_the_book_of_the_courtier169gq.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/gofiguj/dilapidated_building_report.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/95547867116.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/cbs_news_app_apk.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_a4c7077a0a5e4361b4dfe4b2c52121af.pdf?index=trueIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_2a705fe6d67f4ff9aa6bd5884e03effd.pdf?index=trueIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_d7621256e12144d985fd13d87f729bf4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/ada_guidelines_2018_ppt.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000174b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174B5 5288 bytes
SHA-256: 7c3c8d2dca65df72a8a7bb51afee3c596caa5cca9336580df8efceb87d66bd54
font_01_sfnt_off000186c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186C2 13984 bytes
SHA-256: acb550ed36b54a46f42a0bfcbc643e350607da98afd9812f58b1326bfc063b40
font_02_sfnt_off0001b4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4E1 16160 bytes
SHA-256: 54315d79845bfc0267e073efeb8b2bec661e1f42092a34d931dc0f345f842b17

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