Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b7ae0ca4db1726…

MALICIOUS

PDF

75.9 KB Created: 2021-02-23 17:08:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f6e42cf60565ab1ce649995005a34025 SHA-1: 7954215a216df1f474efdafb074cb875cbca0374 SHA-256: e0b7ae0ca4db17265a8e7d2d7ae8846b5fc4abe4e6d77ffc6de5ff4f33b7dbcd
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external domains, many of which are hosted on disposable or link-farm-like services. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to redirect users to potentially harmful content. No scripts were extracted, but the high number of external links and the ML detection point towards a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://maypoin.ru/strik?utm_term=kitchenaid+coffee+burr+grinder+settings PDF link annotation
    • https://cdn.sqhk.co/luxixumogez/HjageuF/simple_vanilla_cake_recipe_using_cake_flour.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/bt1qhf9/hideaway_pizza_stillwater_menu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501810/normal_6010d353ac2ff.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/fjiypbR/four_pics_and_one_word_5_letters.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370288/normal_5ff1bd4c1c669.pdfIn PDF document text
    • https://cdn.sqhk.co/keximovib/dlhOGjd/16080744177.pdfIn PDF document text
    • https://cdn.sqhk.co/genamudazunu/xZjbhio/bluff_city_law_season_cancelled.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/Wrhf4hi/video_maker_for_youtube_app.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/dHjeHV5/wize_eyes_massapequa_massapequa_ny.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408009/normal_6020cd0c85c0a.pdfIn PDF document text
    • https://cdn.sqhk.co/fezavomol/ahfpYMC/retroarch_nintendo_switch_download.pdfIn PDF document text
    • http://magazinrf.xyz/367507159650gz4s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459175/normal_6033843fa599f.pdfIn PDF document text
    • https://cdn.sqhk.co/rejiwosujupa/3NSepXK/75512055868.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rarefovukafulu.rf.gd/manuscript_templates_for_conference_proceedings_ieee.pdfIn PDF document text
    • http://vokulokunupada.epizy.com/36044076772.pdfIn PDF document text
    • http://rabopusafat.epizy.com/antonyms_and_synonyms_worksheets_for_4th_grade.pdfIn PDF document text
    • http://xorikija.epizy.com/migifamoka.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_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 5360 bytes
SHA-256: 52469d3d32990f2338a83c456e25fd913912d111087f0218389f408456027fb2
font_01_sfnt_off0000fc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 11144 bytes
SHA-256: c33cfe8c067489766b8d28cd049f5a7a5567b12d687c9118d39b4d099e8f1448

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