Malicious PDF — malware analysis report

Static analysis result for SHA-256 53974a4603d5f8eb…

MALICIOUS

PDF

77.9 KB Created: 2021-05-15 19:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 50d320f4e6214dcb0a8f56bee5b05370 SHA-1: 408d61cc66cd61a7a37127537d4e80ed4820f8c2 SHA-256: 53974a4603d5f8eba2c29e035299574b7a73077aaa3108aa31f2a39530cdc5f7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with the primary ones pointing to suspicious domains like vilenefex.ru and italysummer.fun, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, designed to redirect users to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/strik?utm_term=pre+cooked+ham+oven+temperature PDF link annotation
    • http://italysummer.fun/zixegugetonifigoxotebeliqxt51.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwesedujila/jijLEYw/73440971765.pdfIn PDF document text
    • http://like-store.site/mepozulazupivalaloi98v.pdfIn PDF document text
    • http://meriline.store/80200524759ucij9.pdfIn PDF document text
    • http://wizomokupelew.iblogger.org/how_to_trade_todays_market.pdfIn PDF document text
    • https://cdn.sqhk.co/letojeka/bn3S2gh/kifezalovewuk.pdfIn PDF document text
    • http://smartcreditscore.info/kifepofeu8os.pdfIn PDF document text
    • https://cdn.sqhk.co/jisanipu/7jihhyZ/gokosozopatusasibopi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409630/normal_5fe564fd5818a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451950/normal_5fd28c9bc14fb.pdfIn PDF document text
    • http://bit-ipo.ru/conic_sections_problems_and_answersknztc.pdfIn PDF document text
    • https://cdn.sqhk.co/sulezudipozi/jgdiehb/5591814597.pdfIn PDF document text
    • https://cdn.sqhk.co/vekazedivipi/jAmgjjh/lineage_2_revolution_forum_trading_post.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_60250f7c3dadd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruxuvejefo.epizy.com/51879219252.pdfIn PDF document text
    • http://divakupi.rf.gd/domedubazevili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3277640c-aebb-4efe-8870-874a11a6e2ed/88236675557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e70f3936-2a05-47cb-ace8-d02cabd8ea28/powerstar_ae125_replacement_parts.pdfIn PDF document text
    • http://torexogisodejez.epizy.com/meteo_casinalbo_di_formigine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/743c0a7b-50e4-4f61-9937-3f23571502cc/death_and_the_compass_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2494fda-6c46-447c-9f01-4b9798c6a555/peter_levenda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/491f2d1e-1205-4c7e-9b07-3b7181cdbe32/bobewetawamizenopifoton.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85e26dab-a155-4dc4-93fc-5110c951a2ae/how_to_develop_android_apps_using_python.pdfIn PDF document text
    • http://bifakafuwal.rf.gd/white_old_skool_vans_with_black_line.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_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 5228 bytes
SHA-256: 18ddf2031170e2a05d4f74eb1f76b088bdf20262e0ed8889fe3a1d761c600eff
font_01_sfnt_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 10896 bytes
SHA-256: 03afe14ff31efcfad588a1306c705eb7e2e3edbd89f0e293b3cc10464496305a

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