Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d898c2582759ac5…

MALICIOUS

PDF

86.2 KB Created: 2021-03-24 23:42:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 708068f6e821cdc7226cd8b4f7dcba31 SHA-1: b00e5f900cf28b1de436bb2b6f009acb96e3ee1a SHA-256: 6d898c2582759ac5fa7349a21e85ef2c2ed04f3eec5a6791625b829d2cc54436
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 0.9983

Heuristics 6

  • 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 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://fokemale.ru/123?utm_term=oxygen+os+poco+f1 PDF link annotation
    • https://cdn.sqhk.co/dabozijide/fjftBjb/5578378772.pdfIn PDF document text
    • https://cdn.sqhk.co/lamidipeke/jcY6oVq/samsung_health_monitor_ecg_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445534/normal_603cc9fb41e88.pdfIn PDF document text
    • https://cdn.sqhk.co/nepajenine/hdEkD24/the_walking_dead_movie_1995_watch_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494663/normal_5ffdb5ade6c1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368752/normal_5fefcc4522103.pdfIn PDF document text
    • https://cdn.sqhk.co/wejideduv/atmkxt9/sobodi.pdfIn PDF document text
    • https://cdn.sqhk.co/gunakawujo/dytrpgg/abertis_infraestructuras_sa_annual_report_2017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426557/normal_603536e820f77.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/SMxLt87/jevafemofezapabor.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/bGjgOgc/72946047594.pdfIn PDF document text
    • https://cdn.sqhk.co/bepifopid/eidiaK1/super_salon_game_free_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gelawiweza/math_worksheet_generator_subtraction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e46cb932-5412-4c6a-9d13-f6db3bce1157/5725465604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/618f079c-e267-4c72-879a-dd21847b0bd2/titan_quest_atlantis_ps4_gameplay.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/11728231312.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_a76f316d101a40d0b3ad8f1c813ad3e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/taturi/how_to_bridge_arris_bgw210.pdfIn PDF document text
    • https://0108a07e-94d6-443d-bfa7-575dd38852ad.filesusr.com/ugd/756a01_24da6087cff441838468e1a13e4fba46.pdf?index=trueIn PDF document text
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_910cd8ef826a404498d5d4f750077a20.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b3a8c24-ef71-49f2-8db8-d2ab01e61d98/49023646797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6194d7aa-3fe4-42f5-ac8e-43b1b3f30b25/what_kind_of_fast_food_is_gluten_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecdf872e-0317-4486-9643-1bcc5bb91c17/govoxazoxumudud.pdfIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_f050d4bc6c5c4de4adbc2d92078bdbd7.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 3300 bytes
SHA-256: 89e9e77fd91b9d215cc5b1c74c18c85f4eca10be65536fd6bab20429d689065f
font_01_sfnt_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 4756 bytes
SHA-256: 5db4afbd464e7f7c5bd071d33349537c007d4c8af5b241026121e68cf80e6645
font_02_sfnt_off000106a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 16996 bytes
SHA-256: 224ac98f8ce4ddebf69ef1be24eb190e406458ec14de10072bfacdad359edaae
font_03_sfnt_off00013b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B13 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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