Malicious PDF — malware analysis report

Static analysis result for SHA-256 507170bacc6853fc…

MALICIOUS

PDF

78.9 KB Created: 2021-03-04 03:00:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1770d958d763242d1c47bceece598404 SHA-1: 5fa78a740ebd2ed5ee34310fb95614de320b0de8 SHA-256: 507170bacc6853fcabbb4e7f605054151f9662b60c07139ec22f7edcf4e725b1
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, contains text related to learning objectives, likely a lure to disguise the malicious intent. The presence of external URIs and link farm heuristics indicates a strong likelihood of directing users to malicious sites.

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://nipisod.ru/award?keyword=qu%25C3%25A9+es+un+objetivo+de+aprendizaje+ejemplos PDF link annotation
    • http://vivadoctor.ru/tmb_mapa_metro_barcelonanqkry.pdfIn PDF document text
    • http://palejep.22web.org/b_m_w_car_image.pdfIn PDF document text
    • http://nekemepomisares.22web.org/torodiruper.pdfIn PDF document text
    • http://bioforce-co.site/how_to_download_inkscape_on_ipadzkv2t.pdfIn PDF document text
    • http://amin-ukraine.net/lullaby_songs_for_babies_12_hoursapw6g.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/fdibkji/70683533306.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/uAXgd1n/47733691807.pdfIn PDF document text
    • https://cdn.sqhk.co/fepotifomowa/boicxt2/bollywood_party_song_2019_mp3_free_download_pagalworld.pdfIn PDF document text
    • http://damvglaz1.xyz/arabian_nights_bangla9rrpe.pdfIn PDF document text
    • http://italia-doc.space/childcare_bed_guard_manualju0h0.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/shfXRic/95869179937.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noxagipuputop.rf.gd/guvuderagipaxugilolenev.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/gajekif.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/75187328212.pdfIn PDF document text
    • http://suvugadozomamu.rf.gd/best_project_management_software_microsoft_teams.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_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 5636 bytes
SHA-256: 1b71fc63a481ffe6dcdc0bd8c4e713d5ae7a0e97f2a2a2259901fe10d6968c10
font_01_sfnt_off00010672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 11512 bytes
SHA-256: 76b5c93937537314c2b8711da3ce942f802ec717242e87a66e3f99f747222656

Open this report in the interactive analyzer, or submit your own file for analysis.