Malicious PDF — malware analysis report

Static analysis result for SHA-256 593b1bd2376eaef7…

MALICIOUS

PDF

102.7 KB Created: 2021-03-28 23:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57c479b70ec918db919bc29ef572ae28 SHA-1: b55242b505189c9eb88fd20aeafa75afd8cfe5f6 SHA-256: 593b1bd2376eaef722a157413974f33ed61dec0dcf6fb622e6f1792bbf28390d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing campaigns. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, with one pointing to a suspicious URL (resalured.ru). The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=ark+pvp+progression+guide
    • http://desokore.medianewsonline.com/on_having_no_head_review.pdf
    • https://cdn.sqhk.co/pukojawutev/7idicgi/zuwas.pdf
    • https://nibapexi.weebly.com/uploads/1/3/0/9/130969889/3141971.pdf
    • https://cdn.sqhk.co/tawavumazo/SifwX9p/u_mobile_app_for_android_free_download.pdf
    • https://cdn.sqhk.co/totimujid/XkCsihg/old_ringtone_free_download_for_android.pdf
    • https://mivijupa.weebly.com/uploads/1/3/4/5/134578330/3d042dee7710867.pdf
    • http://ganoget.scienceontheweb.net/67425858618.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d8318aaf-a0f2-49d4-aaa4-af90020dff40/fuxoguluzuros.pdf
    • https://uploads.strikinglycdn.com/files/9178af52-5802-4b38-b506-f3664af6622f/49318174195.pdf
    • http://wonenuw.epizy.com/madezuji.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/upload_invoice_template_to_quickbooks_online.pdf
    • https://s3.amazonaws.com/resixexi/niferetokuweduvibovifi.pdf
    • https://uploads.strikinglycdn.com/files/ce011b91-9b60-409f-bc12-234b8e0d5e53/ganijijamizeva.pdf
    • https://s3.amazonaws.com/nakuzafol/vw_t5_camper_van_buying_guide.pdf
    • http://wolobugoxew.myartsonline.com/how_to_play_dd_for_beginners.pdf
    • http://saboveliga.myartsonline.com/pyramide_des_besoins_de_maslow_marketing.pdf
    • https://s3.amazonaws.com/sefepugolupalax/batman_the_killing_joke_end_credit_scene.pdf
    • http://mapegolirij.epizy.com/32649986055.pdf
    • http://ketoxuxun.epizy.com/chicago_manual_of_style_in_text_citation_format.pdf
    • https://s3.amazonaws.com/xumakomowi/kgf_chapter_2_songs_telugu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014001.bin
cf5865d6f84f32fea15a5075d24cce18c3a2c0f7e7716c984cdaf50a0487f7c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14001 4996 bytes
font_01_sfnt_off00015124.bin
8dfa84ddc92e19ceb4f2521195cd8b80488a3a87b99dff8709cd1b99a291ff34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15124 11524 bytes
font_02_sfnt_off00017891.bin
c86ec25fc5176ff29326d942c001ea6014b40b04356a9b1eefc9035b1c721a95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17891 16140 bytes

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