Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc57d2cd3115fef…

MALICIOUS

PDF

128.3 KB Created: 2021-03-14 12:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 47dce6a5b5cfbe9503a74a9b1e2d047c SHA-1: 565de3c679958fe7ccc32f92fe0791d5ba2e1e71 SHA-256: abc57d2cd3115fefbd950e22e0a71738a3fc9e4c9c46c8183de79d4cdc2fba8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URLs, many hosted on disposable domains, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords related to technical diagrams, likely serving as a lure to encourage downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/award?keyword=12+volt+alternator+wiring+diagram+pdf PDF link annotation
    • http://tigibisolefora.mygamesonline.org/12865221979.pdfIn PDF document text
    • https://cdn.sqhk.co/rowazazapa/ekjg49Y/flip_water_bottle_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365602/normal_5ffb6ef32765d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417519/normal_603c712a63ce1.pdfIn PDF document text
    • http://jonipifenukiz.mygamesonline.org/mazado.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/eKRfEpA/modern_warfare_3_remastered_release_date.pdfIn PDF document text
    • http://fesalasan.mygamesonline.org/learn_english_through_story_level_2_notting_hill_english_story_for_learning_english_with_subtitles.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/Tia8xje/82757104298.pdfIn PDF document text
    • http://rotiwopofeze.mywebcommunity.org/psychology_quotes_on_human_behavior.pdfIn PDF document text
    • https://cdn.sqhk.co/tawibonikigo/hdvhzji/cisco_webex_room_kit_mini_software.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/fjigdhc/37264217758.pdfIn PDF document text
    • http://napodosawukezob.getenjoyment.net/quotes_from_the_book_speak_by_laurie_halse_anderson_with_page_numbers.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/ijiichj/wiganu.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/borrower_authorization_form.pdfIn PDF document text
    • http://lalabomujulimof.mywebcommunity.org/tecnologie_applicate_ai_materiali_e_ai_processi_produttivi_2.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/hiKrzD6/boom_beach_hack_ios_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480898/normal_5fe8ebc6983b7.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/liwara/baidu_cloud_client.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/looming_tower_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/muxefumekorivum.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/64571119017.pdfIn PDF document text
    • http://livirava.atwebpages.com/jumitosanusov.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ab8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB8C 5212 bytes
SHA-256: 72e46f762677f95fb84726736c713847c32ef7dd17bf01098d12186fef78d98c
font_01_sfnt_off0001bd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD3E 11660 bytes
SHA-256: 4d5b047163de6677da3b21332fc464ea62a6ef5d53812de56d1f25d448f0dfc4
font_02_sfnt_off0001e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4BE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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