Malicious PDF — malware analysis report

Static analysis result for SHA-256 a082a8c54b0d3e6a…

MALICIOUS

PDF

83.1 KB Created: 2021-03-27 17:29:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f0c361671cf6e5eecb133088eb409424 SHA-1: 237e0597eda237f3add7f3d55b9942aa5d1c0a89 SHA-256: a082a8c54b0d3e6ae5a04c43b0c749b5e4d2f76c313076c9c631c4c0729e6fc0
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm, a common tactic for phishing or malware distribution. The primary URL, https://maypoin.ru/strik?utm_term=shimano+ultegra+6870+di2+hydro+disc+upgrade+kit, is presented as a product link, likely to deceive the user into clicking it. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest malicious intent, likely leading to a phishing page or a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://maypoin.ru/strik?utm_term=shimano+ultegra+6870+di2+hydro+disc+upgrade+kit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474746/normal_5ff9557acab36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475406/normal_604d25cc8dfc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381102/normal_603711bf47ec1.pdfIn PDF document text
    • http://setovewurepenu.22web.org/17742393666.pdfIn PDF document text
    • http://ritegifufefut.scienceontheweb.net/xapafigoxozu.pdfIn PDF document text
    • https://cdn.sqhk.co/liwifetil/icjgkjj/atomos_ninja_v_5_zoll_4k_hdmi_recorder.pdfIn PDF document text
    • http://bidimiw.sportsontheweb.net/toro_22in_recycler_lawn_mower_air_filter.pdfIn PDF document text
    • https://cdn.sqhk.co/sakupiraf/6H6ge1p/99668724964.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/echhHod/capture_the_flag_game_online_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/dasadogiso/ihpUxhj/kuxojegedewevud.pdfIn PDF document text
    • http://kovemiwixipogaf.66ghz.com/advertising_vocabulary_list.pdfIn PDF document text
    • https://cdn.sqhk.co/jejekije/bMghgdl/5235927392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407318/normal_6057c95f4b17b.pdfIn PDF document text
    • http://libopadu.scienceontheweb.net/53637090267.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/dOibjbm/voltage_drop_testing_motor.pdfIn PDF document text
    • https://cdn.sqhk.co/bujerinalo/XhfghY4/fobenajoninogetokalomuzi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_84b47df8deb94dec8c1f2a7a3b734035.pdf?index=trueIn PDF document text
    • http://lavovexerok.epizy.com/60694720588.pdfIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_0ff0dc05c25049d4aa566a6678f55457.pdf?index=trueIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_dc10f14d11ae4b0d967f646ee5d2eec2.pdf?index=trueIn PDF document text
    • http://jeximojela.myartsonline.com/99247023069.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/mhw_leshen_quest_guide.pdfIn PDF document text
    • http://fatekikatamepis.rf.gd/miller_millermatic_130_mig_welder.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 6340 bytes
SHA-256: ebd3ee43c7d2bd9def7afc3f3cd5b3013a932fd41597e1ce82944f512c8ad5cb
font_01_sfnt_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 10704 bytes
SHA-256: fe1ebb2109c1780442ed79c3e63060fd9c5f923f2ab7adb238e70ac959967521
font_02_sfnt_off00013041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13041 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c