Malicious PDF — malware analysis report

Static analysis result for SHA-256 4201870182dd8a49…

MALICIOUS

PDF

79.0 KB Created: 2021-04-04 04:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 38ef6f52316d8fecc42e0854730b7d3f SHA-1: 2a81c3588d14b9f39dc47e3cb35f2d3fd3a0a912 SHA-256: 4201870182dd8a4996611402e67ff0ba009425d23fa487b5949ae5fbb9ff5ebd
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 0.9993

Heuristics 5

  • 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 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://jacksth.ru/123?utm_term=business+english+phrasal+verbs+exercises+pdf PDF link annotation
    • http://pelistens.xyz/literary_terms_worksheet_answersdbmsq.pdfIn PDF document text
    • http://rodsfish.club/sequence_diagram_examplesjxnpd.pdfIn PDF document text
    • https://cdn.sqhk.co/gexopoku/gdjhLie/nps_yellowstone_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376856/normal_60185003dd481.pdfIn PDF document text
    • http://antinomi.design/xudewujiludorow6cb8y.pdfIn PDF document text
    • http://hesap-al-sat.com/oracle_pl_sql_datetime_nowgpsih.pdfIn PDF document text
    • http://streichpack.online/6253078273zkuq0.pdfIn PDF document text
    • http://pimesizawox.sportsontheweb.net/les_algorithmes_cours.pdfIn PDF document text
    • http://blog-millionaire.buzz/wizudijarerezijemagufijmkvs6.pdfIn PDF document text
    • https://cdn.sqhk.co/dutedape/jaIOkN6/hachi_hachi_loves_park.pdfIn PDF document text
    • http://kefudepoduwudi.sportsontheweb.net/amazing_grace_chords_f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387813/normal_6030d927ed3cf.pdfIn PDF document text
    • http://kushtanash.ru/tezibex6k59v.pdfIn PDF document text
    • http://gukevipagopu.mywebcommunity.org/caged_system_primer.pdfIn PDF document text
    • https://cdn.sqhk.co/wofosavafiju/wEhchgs/download_snapseed_for_pc_windows_7_8.pdfIn PDF document text
    • https://cdn.sqhk.co/wibafozadil/0hghgjb/knives_out_house_location.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/zij3ia5/world_nature_conservation_day_posters.pdfIn PDF document text
    • http://fridgeservice.ru/498059533349szmu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moxosutemow.onlinewebshop.net/cambridge_checkpoint_mathematics_practice_book_8.pdfIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_8d095caf28ea406db52169fe8aa37f10.pdf?index=trueIn PDF document text
    • http://muluwokixo.onlinewebshop.net/free_download_english_to_sindhi_dictionary.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_e16953f2c4c045d3a04ae10ca04ad2dd.pdf?index=trueIn PDF document text
    • https://7043ee2c-bc2d-4d46-b82c-b0075177c1aa.filesusr.com/ugd/f862b5_e0c5b07e2c474280b428b4c597610d59.pdf?index=trueIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_4de5482f28bc47f2bedb6bff9288805b.pdf?index=trueIn PDF document text
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_c027b408488544bca8ea901fc2702915.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_off0000f6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E1 5732 bytes
SHA-256: bbd168de1b0a5874a0e10184d34e61c38bf0dfc4896eeaba0da00c49448fd748
font_01_sfnt_off00010a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6B 10480 bytes
SHA-256: 3b6d23bb27f0f7e7276dec09a04a0b92654ba2b321a4c66277279aa44d39524c

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