Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4df0feac3ad378…

MALICIOUS

PDF

74.3 KB Created: 2021-03-06 09:53:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 409929853f542b4cb84b7e457a4d380a SHA-1: 8ec8c03776f72dc3e418f988cdaf3c4044f93c34 SHA-256: 4f4df0feac3ad378679e736185b9e4a34670c5f098dbcd14403b8faf705a2c62
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document body, though heavily obfuscated, suggests a resume theme, which is a common lure for spearphishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/123?utm_term=professional+aircraft+maintenance+technician+resume PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478933/normal_60045450a1468.pdfIn PDF document text
    • http://arfesopt.com/jane_stokes_how_to_do_media_and_cultural_studies8caj0.pdfIn PDF document text
    • http://betflixguvenilirmi.com/papyrus_of_ani_egyptian_book_of_the_deadycdvn.pdfIn PDF document text
    • http://lavka-karamel.ru/git_visual_studio_2015_tutorialptk0k.pdfIn PDF document text
    • http://therarbooks.com/vigoradipabanejpal0q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420765/normal_5fc8fd903c2de.pdfIn PDF document text
    • http://healthyforczechrepublic.site/atem_television_studio_pro_4k_software_controlsjhuu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448551/normal_5fe95b845b7c7.pdfIn PDF document text
    • http://pomirkapa.site/batzal_roof_designer_3ds_max_2014lu8ga.pdfIn PDF document text
    • http://espaceabonnes.com/allu_arjun_songstdrlj.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/what_does_phthalo_green_look_likeac7us.pdfIn PDF document text
    • http://ejinaya.com/87352111849to4q0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/26688a4b-4123-44c3-85cb-d977f109e685/washing_machine_repairs_sydney_eastern_suburbs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d852163-2d57-4770-a529-361fbe22612d/xuxufoxenupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef97e90d-a742-40d5-9807-e2d5a6b2038e/gender_is_burning_questions_of_appropriation_and_subversion_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/275a6adc-2668-4743-8158-b4472d20d049/mijixanuzijawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e534e9e6-fc35-4894-940c-ccb21b10d7ce/older_cars_and_trucks_for_sale_on_craigslist_in_indiana.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_off0000e546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE546 5124 bytes
SHA-256: 727d146864a2743855aef08257562dc7eaee3f545a2ef36d3df50a22c8033186
font_01_sfnt_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 11060 bytes
SHA-256: 8ef73af1464734a6834e282efbe6ab165794a1c6028af941c1d0bb98be7c6352

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