Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85c99e02c9e3edf…

MALICIOUS

PDF

71.7 KB Created: 2021-03-15 00:12:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77169ee5686924a0dca4a8c96616edb3 SHA-1: d1487fb1a44d86eef538e282148eab1488839d45 SHA-256: e85c99e02c9e3edf7d98e295912cee016dfa19c98a727fe7fd9f70ed5c1ff3d1
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, suggesting a link farm or SEO manipulation tactic, with one URL pointing to a potentially malicious PDF. While no scripts were extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=vmware+workstation+manually+delete+snapshot+files
    • http://paxezimusosesa.scienceontheweb.net/61428398185.pdf
    • http://siwupojotuj.getenjoyment.net/64040816604.pdf
    • http://tedurelaseji.mygamesonline.org/manual_unico_de_policia_judicial_version_2.pdf
    • https://cdn.sqhk.co/fojilude/jgc9Lid/minecraft_download_free_download_chromebook.pdf
    • https://cdn.sqhk.co/wufotubi/gcgfhid/alia_bhatt_star_life_mod_apk_hack_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dezinolabebosod.atwebpages.com/warlock_dnd_5e.pdf
    • http://fubavinexazixo.onlinewebshop.net/geronimo_stilton_collection_books.pdf
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_415320a26c1041838eba23961ad0f8ff.pdf?index=true
    • http://japinoxizidunub.myartsonline.com/bateduvixesojeb.pdf
    • https://uploads.strikinglycdn.com/files/4ea9c054-baee-4100-8b21-52764566971d/what_is_the_latest_version_of_the_eagle_scout_workbook.pdf
    • http://manosotidokef.myartsonline.com/12651167124.pdf
    • https://uploads.strikinglycdn.com/files/3f0f5381-980b-41a4-9d1d-54dbffb36cf5/voxetebirepifibogibe.pdf
    • https://uploads.strikinglycdn.com/files/98090833-6e97-464c-a33d-ce885c6a1cd7/gigizizem.pdf
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_8103ccbad9ea444dab93c7df85d6eba1.pdf?index=true
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_fc736757bf3847adb944c5828d32dde9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d7188961-1ba6-424c-ad40-ec1eaec55673/98929821675.pdf
    • https://uploads.strikinglycdn.com/files/a213abb3-9313-46e5-9f1e-458797f28598/lukewamoselofuxadat.pdf
    • http://duvodix.myartsonline.com/foguragevumok.pdf
    • https://uploads.strikinglycdn.com/files/1f0029cc-d844-4d8c-8ada-96525fe88bd3/what_is_dialectic_in_philosophy.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daca.bin
e3b0f694b3b27ce0af6a0217f83f9064bb54dd45d0d4a5e84edc55336eafc841		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDACA 5504 bytes
font_01_sfnt_off0000ed76.bin
0641f055fb592cf99d542e0f4a48bc2409b1f92c56256b2dc343a0ad317eef6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 10344 bytes

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