Malicious PDF — malware analysis report

Static analysis result for SHA-256 24990bb44121ed85…

MALICIOUS

PDF

78.5 KB Created: 2021-03-02 23:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 97dff84d6b51485c7197b15342be27f9 SHA-1: 1c09b038d06e2fceb8fddf3a2b34eb75a296cf7d SHA-256: 24990bb44121ed85ade12584cdd2bfeafae27c6828f2a8eb0f05c772dea4dcbe
126 Risk Score

Malware Insights

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

The file was detected by multiple heuristics and ML classifiers as malicious, specifically flagging it as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The presence of external URIs and the link farm heuristic strongly suggest the PDF's purpose is to redirect the user to malicious content.

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://xezojetit.ru/wix?keyword=mxl+4000+mic PDF link annotation
    • https://cdn.sqhk.co/rejoxapuzopa/ajgvssa/mebopogusu.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/heVlhh4/glider_simulator_online.pdfIn PDF document text
    • https://cdn.sqhk.co/jozanafe/Kmgc6he/snake_vs_block_unblocked_games.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/free_japanese_booksbkdlt.pdfIn PDF document text
    • http://goodsun.space/13450271573ioowv.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/gogumakojo.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/how_to_use_omron_intellisense_wrist_blood_pressure_monitor.pdfIn PDF document text
    • http://petrol-v-pol-price.site/truck_simulator_xbox_one_release_dateu8g51.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/how_to_get_a_vet_assistant_certificate.pdfIn PDF document text
    • https://cdn.sqhk.co/lilavokolet/ijVhzR1/fusamalad.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/thrawn_alliances_audiobook.pdfIn PDF document text
    • http://klokisik.space/pebezebitomezj4ilz.pdfIn PDF document text
    • http://galufixagomedo.getenjoyment.net/fepumapo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sewoxoxitif.rf.gd/charlie_and_the_chocolate_factory_book_pages.pdfIn PDF document text
    • http://vutaxinasiva.epizy.com/jiwifexaveku.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_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 4764 bytes
SHA-256: e6f8357541f03ca1e64fb75da7ec6397b4247376621086974c754aa7b3424791
font_01_sfnt_off00010997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 10532 bytes
SHA-256: accb6f99ddcd91417c6456b92ba5f63f4108549adbb11deef17f3fc27041fc72

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