Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fbfb14d73b3194…

MALICIOUS

PDF

67.1 KB Created: 2021-03-28 09:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9a49496495746dd91797055cb8356774 SHA-1: 5d074d60514a0ea13e4564cf656a8d6afd9b8199 SHA-256: c5fbfb14d73b31945be8033cb797350504a5ee8f239e7d8277c2f0a8c07d56eb
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 0.9998

Heuristics 5

  • 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 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://golowaki.ru/wix?keyword=nystce+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426820/normal_602c27a7a7384.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453575/normal_5ff71888a45df.pdfIn PDF document text
    • http://zaralutodunuwa.66ghz.com/ladofokajadil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473890/normal_601689c375791.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/5c99d349-7117-4668-9981-fae1f8549f91/90579920923.pdfIn PDF document text
    • http://suvokejixu.epizy.com/wordbrain_2_answers_literature_level_1.pdfIn PDF document text
    • http://rikekovitopog.rf.gd/difference_between_monocot_and_dicot_root.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed5ec3ab-e547-4d76-91b0-1d7009f0f48b/bexabebalanemabumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e00f7338-fdf0-47b2-bd5d-c6ca8d29154f/painting_easel_stand_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88d347c2-6fb3-4934-b7a3-de81f9bcc107/19680946445.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/mole_to_mole_calculations_answer_key.pdfIn PDF document text
    • http://bodotekufuw.rf.gd/56612879093.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/lataxigeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bae733c-e90f-4eff-be9c-0597c93bf7a4/gerunds_and_infinitives_exercises_grammar_bank.pdfIn PDF document text
    • http://misopipe.rf.gd/play_store_apk_gratis_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb8e3822-2c15-43e4-8aca-4b3f38b25019/kotor_genoharadan_quest_light_side.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6c8c287-8719-431b-9ea2-4c85c7e68eb2/does_salvation_army_bell_ringers_get_paid.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/juvamuruvanoziwedi.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_off0000cb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB35 4840 bytes
SHA-256: 1d946aaa6fa4ef292c91e25a73161f5c0a35eb3245dcd9f8c659ef0e51019411
font_01_sfnt_off0000dbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD5 10552 bytes
SHA-256: 97627f01dfe283248cad5836e98fb191383cce848255ccd37b78e95217ff79cb

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