Malicious PDF — malware analysis report

Static analysis result for SHA-256 316a8f2d81a64941…

MALICIOUS

PDF

76.6 KB Created: 2021-03-05 10:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a6db3b2b761ddb6c7746c29d88c652ad SHA-1: 5e230fc743478bb1cca68e484a987bed1dc4e0f0 SHA-256: 316a8f2d81a64941e4049e74631ca4ba94b473b6b6896f55f4937dbd2a6d3bb7
156 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 0.9995

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 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.
  • 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://lozipotod.ru/123?utm_term=what+should+normal+a1c+levels+be PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380682/normal_60184ca4f1521.pdfIn PDF document text
    • http://handler-autoscout24.com/flow_shear_stress_equationdygld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471683/normal_603d3f39e5f11.pdfIn PDF document text
    • http://replyua.site/terimemidovitokisikyav7w.pdfIn PDF document text
    • http://50off.pro/44488685879ixzy.pdfIn PDF document text
    • http://opssmall.space/frosty_the_snowman_song_lyrics_and_chordsgrjeb.pdfIn PDF document text
    • http://kigurumi.org/self_appraisal_answers_examples_for_administrative_assistantpzmfo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502721/normal_5ff64f42abf26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412181/normal_60117c72b3640.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499319/normal_600ea012f0589.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_80f20f0e5a224a3c9361018d02cfde58.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/verirejon/aluminium_alloy_1100_datasheet.pdfIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_01c081f0d19f43eda5cf92dc04083a31.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mefovu/54760695983.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/pentair_minimax_nt_error_code_lo.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/bomberman_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/dsei30-_06a_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/95634857108.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/accident_reports_north_county_san_diego.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/kulavigiwivibixiriw.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/ariston_europrisma_water_heater_installation_manual.pdfIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_d295abdaa454401b89b9b3a3019c7442.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_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 5444 bytes
SHA-256: a16aff05f465ccf0ee0abe66c2bc3969f87dcb2e57186336bd27ebf0a911e793
font_01_sfnt_off00010154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10154 10388 bytes
SHA-256: 64283f3bc9430614f5c3fa6b28f965bc9d3208a97cc7a5ab66a71af00513584e

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