Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd37883a53ff4bc…

MALICIOUS

PDF

75.1 KB Created: 2021-03-17 07:24:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8421ebf15151d05edcfedbddfab2bb9b SHA-1: 117889102ff4133f98f39d153f6bc0def3093af0 SHA-256: 6dd37883a53ff4bc598d2740eda2a33e663f1f04c73602147a680d3c65c2e5a5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

Heuristics 6

  • 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 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://bologen.ru/123?utm_term=pdf+quartz+filter PDF link annotation
    • https://cdn.sqhk.co/vasibejovej/rThhUie/super_mario_world_japanese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467571/normal_6011d1b41629b.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvonazavo/r0Jgdge/look_up_pottery_barn_credit_card_number.pdfIn PDF document text
    • http://the-glow.ru/five_nights_at_freddy_s_movie_postera3w3s.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/Bgigjn9/4746442577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465908/normal_5fd0c03391541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_604475a5dfa8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403560/normal_604e55b756d9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503197/normal_603608068eb1b.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/giGhcqL/suxokusesadarisuxutawomo.pdfIn PDF document text
    • https://cdn.sqhk.co/sizebadit/Gghnwho/18340899733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413968/normal_603b44b45cae6.pdfIn PDF document text
    • http://ita-bio.space/what_book_does_percy_throw_an_apple_at_annabethfmlem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_604015a386040.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/30813412-347a-42f6-a86b-54edd87c143e/diferencias_entre_monarquia_y_republica_como_forma_de_gobierno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c03315d-23b1-4218-b867-8033f334dcdb/audio_technica_system_10_pro_vs_shure.pdfIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_371729ce84a048c28bb1a0fb22029f89.pdf?index=trueIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_1d06d2ff0f484471970c31a55e4a9d32.pdf?index=trueIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_bcbcea0847544456880700ac355644bd.pdf?index=trueIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_911f616a5e864985bbd8bf83f61f25b6.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_off0000e76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 4900 bytes
SHA-256: 47225d41cd381b325ffb85ced96fb4627b7bced7f467967d04ee8547440e3ee9
font_01_sfnt_off0000f82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 11676 bytes
SHA-256: dd2c195f00712df5b0096ce93dcfdcb156c20960b54d63fb76a7578daae8be69

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