Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6f9e5bec78bdb4…

MALICIOUS

PDF

81.0 KB Created: 2021-04-05 06:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 00c2a3b6ef7d21696c8122d547cc236a SHA-1: bcbfe5f2c796fe214fd8b33d6b6d6e2dba5187a7 SHA-256: 6b6f9e5bec78bdb49f034c86d59a57e6e06ee945339838adace7442f0520c4d4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains a large number of external links, forming a link farm, with the primary suspicious URL being https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_5b01697c089e4c28ad3e4a9601c5604b.pdf?index=true. The document body is heavily obfuscated and unreadable, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests a malicious intent, possibly to distribute further malware or engage in SEO abuse.

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 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 http://malapiwo.66ghz.com/10337507623.pdf In PDF document text
    • http://dulexip.22web.org/bsci_social_audit_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387433/normal_604cfb55547ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493198/normal_60583c6c7b0b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/KjdSuPfhPRY/wb?keyword=sad%20love%20poems%20in%20spanishPDF link annotation
    • https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_5b01697c089e4c28ad3e4a9601c5604b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/5434096467.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/vijotasejipagokowujuvopov.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/jezatip.pdfIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_a39a75588f0149b58765b0cb1b48242e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fovezewi/behaviourism_and_mentalism.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/the_road_movie_free_download_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d916ace7-1430-46e6-8390-2e0247a884e1/dash_diet_menu_plan_phase_1.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/hd_video_player_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/gukixoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fdadb8c-358c-418a-bb5c-e64a1b2c731d/likag.pdfIn PDF document text
    • http://fosufikitovirir.rf.gd/39614701363.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_e46594cf7c104cf9b37a99456f149ada.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/54616901343.pdfIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_eb412947315e4da181024c40c16d7a9d.pdf?index=trueIn PDF document text
    • http://loxeputogojew.rf.gd/13_colonies_map_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/broken_heart_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b04cd127-d5db-400c-bd43-a5aace762bf0/operations_research_graduate_programs.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/peliwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e974a09-24c8-4137-a245-56ae7571aaf7/what_are_the_tools_used_in_electrical_engineering.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 5268 bytes
SHA-256: c71073667fae19ce2dba18f49c852401b87bdb8f99ab06a5a19f3c632ea190bc
font_01_sfnt_off0001115d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 10920 bytes
SHA-256: 14af16176e1fb4755ed6c2933b9918562b61dce1c29659d3802c2c243cdace49

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