Malicious PDF — malware analysis report

Static analysis result for SHA-256 618563f6a38258a9…

MALICIOUS

PDF

76.8 KB Created: 2021-03-15 17:23:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b40839aece5f304ac4e81dbea6e4d2a2 SHA-1: 91cff7dd02e3940dc42bcb728a2a03149d88fe08 SHA-256: 618563f6a38258a9ff2290f54bf89db9aea46709e8db4023e214a57d23ba46bb
196 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. It uses a password-protected-archive lure. 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 0.9996

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dafemum.ru/aws?utm_term=safe+internet+safety+rules PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412999/normal_602adeaf6f015.pdfIn PDF document text
    • http://japancar-sib.ru/gisizopelowd0xf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529024/normal_6006d4491a904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504922/normal_602d6dd843ef9.pdfIn PDF document text
    • http://vashmaster.info/que_significa_soar_que_se_me_caen_los_dientes_de_enfrente9q8w9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479925/normal_6025ddb54e346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483842/normal_6019d656bf79d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/forupokisip/easybib_apa_citation_format.pdfIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_2c77e9a60f9f43eb9b45756d714c658f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nagudo/28327572193.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/47046921519.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_fe04a474a681485d83b229efde8afc8d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/apus_launcher_latest_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/chelsea_fc_wallpapers_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/adverbs_of_manner_place_and_time_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/fsbpt_npte_score_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/how_to_reset_daikin_error_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/76364835227.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/sertifikat_akreditasi_program_studi_ban_pt.pdfIn PDF document text
    • https://a0aae4df-528c-409a-9289-7ccb30f14f54.filesusr.com/ugd/c345b0_abd8170ea62b4717a8361eaab79af248.pdf?index=trueIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_eef5afecafa244db922472ae65f136a1.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_2220505d2048482ab9d6a21190311892.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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12E 4968 bytes
SHA-256: 363bdd331ab366d6719634740c91b8d9f84bdcebe3dcfdc10c7d51e46605f06c
font_01_sfnt_off0001022a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 10620 bytes
SHA-256: 82324098805f583c15ec429d374da476fa651073873087f0f345b32bf80da3cc

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