Malicious PDF — malware analysis report

Static analysis result for SHA-256 f757496e6cc2a506…

MALICIOUS

PDF

129.6 KB Created: 2021-03-17 02:36:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6aa95af62eacf07fa6df70443f45f78a SHA-1: 5708ac08444e20c1e70d8285ab8805ddc3302416 SHA-256: f757496e6cc2a506bb4e0f18c99e5bdf515164cc27d390b398f4d91b8b674fdb
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The primary malicious URL, 'https://resalured.ru/wix?keyword=%25D8%25AC%25D9%2588%25DA%25A9+%25D9%2587%25D8%25A7%25DB%258C+%25D8%25B2%25DB%258C%25D8%25B1+%25D9%2586%25D8%25A7%25D9%2581%25DB%258C+%25D8%25B2%25D8%25B4%25D8%25AA', is embedded within the document. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://resalured.ru/wix?keyword=%25D8%25AC%25D9%2588%25DA%25A9+%25D9%2587%25D8%25A7%25DB%258C+%25D8%25B2%25DB%258C%25D8%25B1+%25D9%2586%25D8%25A7%25D9%2581%25DB%258C+%25D8%25B2%25D8%25B4%25D8%25AA PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451555/normal_6034caa8de6ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465006/normal_5fe479f867bea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_602b110809d8b.pdfIn PDF document text
    • https://ladetizor.weebly.com/uploads/1/3/4/7/134731735/9514077.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/yiijoWJ/blue_bot_application.pdfIn PDF document text
    • https://cdn.sqhk.co/vakusukereju/Bigo015/gunner_olszewski_punt_return_stats.pdfIn PDF document text
    • https://wajotirege.weebly.com/uploads/1/3/5/3/135306859/sotisejafagituf.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/Bbjjxib/78316617349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422386/normal_602982e1c34bd.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopiroxab/X5rggjd/paper._io_world_conflict_hack.pdfIn PDF document text
    • https://tixuxajus.weebly.com/uploads/1/3/2/6/132682254/bejutikag.pdfIn PDF document text
    • https://cdn.sqhk.co/mafokesaxuvi/hezieic/jj_heller_better_sheet_music.pdfIn PDF document text
    • http://kokolonesafu.getenjoyment.net/42308223094.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://uploads.strikinglycdn.com/files/7caf35ef-e598-4477-a573-6ecf4cc3fd6f/stevens_320_20_gauge_pistol_grip_stock.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/bemeluvovozoxewiposokelow.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/irving_janis_groupthink_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2abcdc2-02aa-494c-ab82-8f2699abf6ec/chronological_bible_reading_plan_90_days.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07237125-cedd-43be-8e32-b725ebaf62e7/61010095216.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/celebrate_good_times_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/88732350287.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/tuxegafejij.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/bumudewebigom.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/yahoo_mail_latest_version_for_android.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001a992.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A992 35656 bytes
SHA-256: 30682e8d347d5398fb537dbae3bdab9673ba9293a24a54ddad3b99d040934a31
font_00_sfnt_off0001566c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1566C 3396 bytes
SHA-256: b6ec58749aedf04a32bcbe83089c7b58d6f89fb98c48551fcd4be745f6f6cc06
font_01_sfnt_off0001616d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1616D 1796 bytes
SHA-256: 68bbe42c93759ab90c218695aa25c1747b40456063d11b0ac06b51d2514fd3e6
font_02_sfnt_off000169f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169F8 10412 bytes
SHA-256: f6a512c1bbb333a610232645d5b2facb237025bbf07728930e0e7dd680682a74
font_03_sfnt_off00018dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DCD 17964 bytes
SHA-256: 8ecac85bdd568fe770b7618a1fc253d54b3f78f6c9c2182a1ca60e5c9b919058
font_05_sfnt_off0001e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E715 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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