Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa519991a0f3c2ca…

MALICIOUS

PDF

79.5 KB Created: 2021-03-05 13:45:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5c6dcebb17f110e78461de2ee184bba4 SHA-1: 78a7ffde1e78ea0a67a506ea95c71bbfab789f20 SHA-256: fa519991a0f3c2cae772b08354b575fd83e78f44ebdb64b9a66017525f263427
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with several pointing to disposable domains and employing UTM parameters, suggesting a phishing or credential harvesting campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/123?utm_term=carl+jung+8+personality+types+test PDF link annotation
    • http://mazers.fun/is_kaplan_good_for_usmle_step_1cnekc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477164/normal_601f13e085cdf.pdfIn PDF document text
    • http://voirlo.xyz/suwoxud3o6am.pdfIn PDF document text
    • http://makamar.tech/pajesimifhnf0o.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/technics_sl_d20_turntable.pdfIn PDF document text
    • http://befigter.xyz/59418709795zquhu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452862/normal_602dadf350c43.pdfIn PDF document text
    • http://kipegujodup.getenjoyment.net/earth_stove_gl40_manual.pdfIn PDF document text
    • http://ejqy.com/wuzaritebevalonudfrgah.pdfIn PDF document text
    • http://tipografiyav.moscow/day_by_day_hymn6mbwm.pdfIn PDF document text
    • http://hangookoil.ru/vulanasasidofakuvy71z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476750/normal_5febcea5999c7.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/31553488872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_601814d573677.pdfIn PDF document text
    • http://torchqbfl.fun/how_to_change_the_battery_in_a_nixon_sentry_watch8tfgg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/defipedibe/7._1_exploring_exponential_models_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/vapuxomunevizosuso.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/android_games_free_no_ads.pdfIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_a3bc33af21a940d09272a12fdcc24f1a.pdf?index=trueIn PDF document text
    • http://koradanizepagow.myartsonline.com/34461408906.pdfIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_ca3d15549df541a6bf8c986efae89f9c.pdf?index=trueIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_9c3b510af2424f379bc50148cd97e00d.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_off0000f9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 5264 bytes
SHA-256: f051170d819d9049879e41fc51cf601344a700f871364d15cabcd2d0ff6b5f26
font_01_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 10960 bytes
SHA-256: 2e5b4c12f295bb8c15cf1bd4c7e9b89712915c53b168b51a3f293a7a62c091ba

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