Malicious PDF — malware analysis report

Static analysis result for SHA-256 58121cd2792dd8fe…

MALICIOUS

PDF

80.2 KB Created: 2021-03-14 09:45:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 31df347c406b6578b5d4ec365592d244 SHA-1: 5f76e673e325d5ce1680414b169893f0c65e3f09 SHA-256: 58121cd2792dd8fe838e61ddbb645e6541bf241aaf208af5fb1ba754be688ca4
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 0.9997

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://gimoguvi.ru/wix?keyword=hardy+weinberg+equilibrium+lab+answers PDF link annotation
    • http://xufamorazogubov.sportsontheweb.net/minuet_in_g_piano_sheet_music_beethoven.pdfIn PDF document text
    • http://raxewaponoxiv.mygamesonline.org/69175956755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500878/normal_603cb129379d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405195/normal_5fef85ec782cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379849/normal_600638f75e0c4.pdfIn PDF document text
    • https://cdn.sqhk.co/xixumobun/fqhbAqm/zombie_castaways_cheats_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/RhjjaPq/royal_family_of_england_latest_news_hello.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/J7Pgh2Y/hot_wheels_id_app_compatible_devices.pdfIn PDF document text
    • https://cdn.sqhk.co/bogabixexuja/bghwzRA/celestial_pearl_danio_fish_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476123/normal_6020d01b03809.pdfIn PDF document text
    • http://tiluvopira.medianewsonline.com/navien_npe_240a_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485572/normal_601a5703876f1.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/de09f5ae-fcc4-4ff7-80c2-88340f345ced/43248865078.pdfIn PDF document text
    • https://df1d5e35-4e67-4e57-ba41-6141a32c4ecb.filesusr.com/ugd/c54278_04fb9447aec54a7ba0b5c419c401bcfe.pdf?index=trueIn PDF document text
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_231253c4a750413b8e565a5097115de8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a5843a5-d696-4422-979c-147332b40538/game_of_thrones_book_review_1996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e04ff869-c257-490a-97e9-2fc7e97944e0/xeloxevezutakunamujax.pdfIn PDF document text
    • http://nevabaza.atwebpages.com/67292456079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1caa5fb-23e3-4a78-9093-431066202796/how_to_open_a_stuck_washing_machine_filter.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/fodukode.pdfIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_5341001f7de74dfebcb43cc824b9d1de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c27b4f7-5eef-48e7-8de1-4463aef048a7/what_are_personality_assessment_test.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 5564 bytes
SHA-256: f99d9bdde52d4bd7686c8eb154cdc2427fdda11d583cdef07f6bb1cfb16ff15e
font_01_sfnt_off00010cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAB 11508 bytes
SHA-256: 7ca7a40f2b70b7e6a424ad1e465f596fd39faca2601a4b53ef0b1534a547db62

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