Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a91c9bad5bcc3f…

MALICIOUS

PDF

71.6 KB Created: 2021-03-19 22:00:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: bd085ffd683068d2b406655d5c7dc31b SHA-1: d440f326b99d980df4130441467cfca12c438e29 SHA-256: a0a91c9bad5bcc3f56fe6b9d1a4457e888186574895d381c534710deeb152079
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with a primary suspicious URL being https://mezovuduw.ru/wix?keyword=estimating+length+worksheet+pdf. The document body, though heavily obfuscated, suggests a lure related to 'estimating length worksheet pdf', indicating a potential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/wix?keyword=estimating+length+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/zidenesek/HthePjg/monster_avatar_maker_2_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/jifedibodo/ieji9gc/1010712323.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/NSTpibZ/fake_call_plus-_prank_call_app.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/7399552202.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473047/normal_5ff90c18417c1.pdfIn PDF document text
    • http://fuwiduwoxobol.mygamesonline.org/14198128633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466679/normal_604aefe861062.pdfIn PDF document text
    • http://sefexetewizu.iblogger.org/50625048346.pdfIn PDF document text
    • http://christmas-gift.ru/dell_optiplex_gx280_sff_motherboard_specs06ykf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444853/normal_5ff896f5cb849.pdfIn PDF document text
    • https://cdn.sqhk.co/fapebenu/icohjNn/blackberry_z10_autoloader_10._3._3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390641/normal_604a9d4dde222.pdfIn PDF document text
    • http://bidetoluji.getenjoyment.net/ninaturufanoz.pdfIn PDF document text
    • http://dombitarf.ru/lobulxkpsc.pdfIn PDF document text
    • http://politach.com/neeyum_naanum_song_mp3_downloadiysb6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fekidet.rf.gd/how_to_play_fingerstyle_guitar_without_nails.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8045420-4d0e-4da5-9ffe-d89fc00c6fe3/midland_cb_transceiver_75-822_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c5dce0d-577e-4694-adbd-ca05ada7eb1d/68867456504.pdfIn PDF document text
    • http://tokafibalo.epizy.com/jogipajenivatekeliko.pdfIn PDF document text
    • http://befadiw.rf.gd/sabbatical_leave_policy.pdfIn PDF document text
    • http://mugazukadum.onlinewebshop.net/alto_shaam_oven_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d8183da-5703-4aac-a8bd-0882c4069e7b/cisco_switch_sg200-26_default_password.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_off0000db0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0E 5568 bytes
SHA-256: 9b3df9d8129ff33fac80a97656192a45ce06e17245f2f3a1762c017dcc1d6528
font_01_sfnt_off0000ede4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 10364 bytes
SHA-256: 5a1adb7b5a1426848bafbd4c4d9323c7286758d2f792862cbccc195133a36e7c

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