Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b25acf942dca7a3…

MALICIOUS

PDF

70.0 KB Created: 2021-05-15 21:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b2523fb858e0fa3ce32e4ced0ac3a8ff SHA-1: b43eb55965290419d0cb49239916b6e092722428 SHA-256: 0b25acf942dca7a346313e36db4cca3d887e67093d581a9a70bebfceeb2bd22b
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 0.9998

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://resalured.ru/strik?utm_term=design+of+machine+elements+by+faires+4th+edition+pdf PDF link annotation
    • http://forexgeeks.net/stand_by_me_song_lyrics_meaningzoo5n.pdfIn PDF document text
    • http://bukanugizini.mygamesonline.org/96997664263.pdfIn PDF document text
    • http://zurufarovosu.iblogger.org/xogilimi.pdfIn PDF document text
    • http://pet-guru.shop/suforomevezal0w0ob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_2b27c4d82e9a4fc2bcfe8375c8c2758d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gogonof/kujemetujusetemiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b817531-7277-479b-a2cf-ff379abf1988/monster_vs_red_bull_caffeine.pdfIn PDF document text
    • http://suvogiwuxibi.epizy.com/suxekexig.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/zexisukazujoturevonugis.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/81306696330.pdfIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_a8b2c95bed9a4f6c847a275c7b714b2b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/zotofoxix.pdfIn PDF document text
    • http://golunelew.epizy.com/tasijawibemo.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/chaminade_college_school_uniform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b691ac2-0699-4444-a410-d52bc233ecc8/relative_pronouns_exercises_esl.pdfIn PDF document text
    • http://fuzudad.epizy.com/44701134784.pdfIn PDF document text
    • http://tuminexozuvino.atwebpages.com/20516544725.pdfIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_210b6393ec8342148f93d9840a89cb6b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/08f1f58d-23f8-4f8a-8aed-71981845457d/how_to_adjust_idle_on_craftsman_chainsaw.pdfIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_0521b58c97414ca9866234f31667948d.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_off0000d0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E4 5900 bytes
SHA-256: 69ac5e426527641119d771b60e81820e9adefc4ab1e266a449f9f42766e5ab96
font_01_sfnt_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 10996 bytes
SHA-256: 266756b146abfffb856ad448780fb33220ef0b13febc424c0cd91ccd1601ce11

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