Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd67ece0ca7c8f04…

MALICIOUS

PDF

84.7 KB Created: 2021-03-11 11:04:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 564ce84632c3f5f9349f249ce6c8fdb5 SHA-1: ff1ea0acb534f3978ca2d721809801147f925dfa SHA-256: cd67ece0ca7c8f04c4337d8799cb52a417d6131a46826cc496b9e84660ac2bb0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The primary URL, 'https://nipisod.ru/wix?keyword=a+global+history+of+architecture+pdf+free', suggests a lure to download content, which is a common tactic for distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=a+global+history+of+architecture+pdf+free PDF link annotation
    • https://cdn.sqhk.co/zifeduwa/jiboifH/inferno_endless_arcade_shooters.pdfIn PDF document text
    • https://cdn.sqhk.co/lupekute/mvijEji/dragon_quest_builders_2_dash.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/TLJhc4m/swather_trailer_for_sale_craigslist.pdfIn PDF document text
    • https://cdn.sqhk.co/juselivo/aihezji/wind_waker_hero_s_charm_gamecube.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinirumawe/6hcVjgg/badosexom.pdfIn PDF document text
    • http://zumigiguba.22web.org/witeromur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_25f35a37109d4a799b15e395ac960dc6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sixolose/44020343087.pdfIn PDF document text
    • http://pujukejesoteja.epizy.com/bhojpuri_gana_dj_music.pdfIn PDF document text
    • http://mepezugulisow.rf.gd/where_is_oven_igniter_located.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/cv_template_design_free_psd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad44e71e-07b0-4f94-a5e5-db2dc6d48ed0/thermo_king_v300_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/google_sheets_manychat.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/11409007081.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/picsart_12._9_3_premium_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/orion_starshoot_autoguider_phd2.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/poulan_p3314_parts_canada.pdfIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_2427fc2b7b2344e591f01b7421a46910.pdf?index=trueIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_57524fd61ba54503840d0cfe5874f122.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/oblique_asymptotes_of_rational_functions_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24bc2cfd-443a-4d70-9d18-a7f0f10851ee/dozelo.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_1701e0586eac4cb79a4ea666ce82093e.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_off00010c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C82 5648 bytes
SHA-256: d60c33e50193ac03fafe8cf1069fe9fbe9c71024a42094ce6eff7d91df53a947
font_01_sfnt_off00011fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB9 11172 bytes
SHA-256: 7f6054509bf56ffa205b9355537e3a2289854f0f2aac8700230b995588509dc3

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