Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce285206dfdb3012…

MALICIOUS

PDF

81.0 KB Created: 2021-03-25 04:09:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bb9688de724d8ababfad5fe80d772bba SHA-1: 797c9b995aefc45bd66676f6573cb8600f28f740 SHA-256: ce285206dfdb3012cf8a2105f91f413e8e58b739a0b78c7417fd0fc4a530e82f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/strik?utm_term=management+accounting+information+system+slideshare PDF link annotation
    • http://questotzvezd.space/guwusakozitsr6kc.pdfIn PDF document text
    • http://art-practice.org/lelorutuwopefipufaxoxezx9gd2.pdfIn PDF document text
    • http://megatorg.ru/769792828845y4zk.pdfIn PDF document text
    • http://mediaverifiedbadge.com/nsw_off_road_racing_calendar_2020ua0j4.pdfIn PDF document text
    • http://lavka-karamel.ru/pathfinder_2e_core_rulebook_free_download7pmf2.pdfIn PDF document text
    • http://memisada.mygamesonline.org/59936925383.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://uploads.strikinglycdn.com/files/a4e2c39a-adf2-4456-b784-104c9a56a063/3612632581.pdfIn PDF document text
    • https://620678a0-8f5b-407b-881a-8a96a128c1c4.filesusr.com/ugd/25b7a6_d032c7c626fb4a09a41221cbf767592a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6960ed4d-1683-4e8c-bdf3-023b9aff7da2/rosemount_3051s_pressure_transmitter_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a827bc94-f2b8-4bd6-bf03-46b7af925aab/can_you_replace_the_earpads_on_beats_studio.pdfIn PDF document text
    • http://lizolubemerawi.epizy.com/felting_needles_guide.pdfIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_a7f2195faba54d9086fa9907373f6f4d.pdf?index=trueIn PDF document text
    • http://bitezopunofiwu.rf.gd/chevening_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/pictograph_and_bar_graph_worksheets_3rd_grade.pdfIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_5c0a91bf0b1c48f4a82055681afecc1c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fixararololu/75383850671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b682bfb-f009-4ca7-9608-1fc390da3777/beful.pdfIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_9fe8f30b89e0413ea3bdc1766cf2790e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatisake/93342126839.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/77422977834.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/gamestop_used_xbox_one_controller_trade_in_value.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b2a3e79-2c3b-46e9-b637-bb96eef9d6d2/34927145136.pdfIn PDF document text
    • http://padusij.onlinewebshop.net/sijelagofererurowovagope.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_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 5424 bytes
SHA-256: 5aeedfa9ea24f89bb570e7ba14cb4f3910b2ec60e6709ab4a844227e9c5281e5
font_01_sfnt_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 9800 bytes
SHA-256: ba3c06b14bbf354925cf7997b31ff90bfe66fd73b6601e0b5c89274ca1a0e638
font_02_sfnt_off00012779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12779 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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