Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f84f4a1cccc6b14…

MALICIOUS

PDF

121.8 KB Created: 2021-03-14 03:18:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3e0f2584160c337cdb53e7a433fa64d7 SHA-1: 9d51794a900b3b6e3de3900c297972fa6e24084e SHA-256: 1f84f4a1cccc6b1433ce1d1310b34db9daa9ee5273fffc59cf5c092c986b7581
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/award?keyword=opposite+of+always+pdf+vk PDF link annotation
    • http://vaxiliwu.medianewsonline.com/zagg_folio_ipad_air_2_keyboard_case.pdfIn PDF document text
    • http://mexicotop.xyz/40481991740p03c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469860/normal_60347187eacbf.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/wages_of_whiteness_table_of_contents.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368265/normal_5fe339cc5fffc.pdfIn PDF document text
    • http://idealica-italy.site/46385255003dgh9j.pdfIn PDF document text
    • http://propovar.ru/nokoduxugalok1m41b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419626/normal_6042a91738dfa.pdfIn PDF document text
    • http://beautysale.site/all_computer_related_full_forms_downloadyhopa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419430/normal_600022b6682b0.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
    • http://dakafatuvuguviz.atwebpages.com/ti_89_titanium_calculator_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc400421-6d1a-4701-9579-dcac11db2a64/47151831708.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/39640346587.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/acadience_reading_technical_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/aadhar_card_without_enrollment_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b3dcd8-a9ea-4d8a-9743-c3f861c1bca5/mtd_riding_mower_blade_attachment.pdfIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_273ca50c6c53424a8d104a7aaa5c0626.pdf?index=trueIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_ec48443eea6d49ebb50bb671833e2249.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F82 4964 bytes
SHA-256: 14e0d1e717411cdbd0559703d28a624570465889a3bbf2a4bfdd0249988174b3
font_01_sfnt_off0001a091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A091 13092 bytes
SHA-256: 855015396e672c1262d04c3d39a38443253cf4ddbd466b2fefca5abd9c248b76
font_02_sfnt_off0001cbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBB3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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