Malicious PDF — malware analysis report

Static analysis result for SHA-256 28781d1d38bd3b28…

MALICIOUS

PDF

74.4 KB Created: 2021-04-03 02:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e96cced8373067856f5f88cdb13e77d1 SHA-1: e8944b12a247c57063ed2d039fe4ed39bb621417 SHA-256: 28781d1d38bd3b28de103bfb6398d1662a2f400c50da843bacc2b497645565bf
186 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 0.9998

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.
  • 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://xajibur.ru/123?utm_term=believer+video+song+lyrics+in+english PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465264/normal_6022ef31954a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_6019c086df932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458412/normal_60430a3b5007c.pdfIn PDF document text
    • https://cdn.sqhk.co/kufezagivori/hhmjcgg/server_2012_terminal_services_manager_missing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475194/normal_60446a32d503a.pdfIn PDF document text
    • https://cdn.sqhk.co/tefaxobaf/9jcWEia/sound_booster_android_root.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493597/normal_601c781b3d919.pdfIn PDF document text
    • https://cdn.sqhk.co/tedatekalo/jfBgd15/clash_of_clans_update_2020_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365575/normal_5fca0a48d0af4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xamunenefo.rf.gd/compound_sentence_worksheet_grade_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2b596db-d844-49c5-8c27-c4ba30c81d09/36244038250.pdfIn PDF document text
    • http://wiwolobeduju.rf.gd/74962994456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0592f4b6-3b3f-4180-9932-db51374f2aa5/good_credit_score_canada_transunion.pdfIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_4cff7e3f746c4415927e318b40c1afb1.pdf?index=trueIn PDF document text
    • https://99ca13e2-8bf0-45b2-93fa-bbfb519f101f.filesusr.com/ugd/5392be_afd5a5e55711471998b1c3ec463e6407.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb330b7f-0744-4881-8ae6-a4ff033e1af7/is_harry_potter_free_on_amazon_prime.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_off0000e676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE676 5200 bytes
SHA-256: 6fbc3f0659881e85bfff969fcc21b390c23bc43bbfee943f2890793069b437c1
font_01_sfnt_off0000f834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF834 10512 bytes
SHA-256: 4812e2df6722ed2235bb9c68a9e9c068ed959de9fb4e45d697ca4d549930e65d

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