Malicious PDF — malware analysis report

Static analysis result for SHA-256 8532433423ed20ab…

MALICIOUS

PDF

75.8 KB Created: 2021-03-23 14:53:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5783c2276a6baf49d921de6e735483d SHA-1: 78a9348285f6080c34e115b47e4cda0d12e983c1 SHA-256: 8532433423ed20ab80942183e52edb70914a4c26482fb975b05618af9adc91ef
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are suspicious or unknown, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' specifically points to the creation of numerous links, likely to manipulate search engine results or redirect users to malicious sites. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the document is designed to lead users to compromised or malicious web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://lozipotod.ru/wix?keyword=katz+und+maus+zusammenfassung
    • http://raisinshub.club/4644220466p6mxu.pdf
    • http://moradudipomibo.mypressonline.com/what_is_the_meaning_of_song_of_solomon_chapter_1.pdf
    • http://bizowokare.getenjoyment.net/60599620370.pdf
    • http://fasoxuxesatilu.sportsontheweb.net/tour_costing_and_pricing.pdf
    • http://itfamily.pro/silugyr5wl.pdf
    • http://easterthjg.com/ice_cream_truck_song_cazwell_lyricsfjsk8.pdf
    • http://infokurs.design/91636643787loeba.pdf
    • http://fasoxuxesatilu.sportsontheweb.net/tour_
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/673e3542-812d-4a7a-b237-d32b2a6b1570/machine_learning_with_r_coursera.pdf
    • https://uploads.strikinglycdn.com/files/00b60b45-4109-4de8-97fc-37c088543d8c/scholarship_essays_for_high_school_students.pdf
    • https://uploads.strikinglycdn.com/files/366fc62c-34dc-4e58-bfbd-d1138bf960b6/24980368645.pdf
    • https://s3.amazonaws.com/bodajaku/dreadfrost_boreus_guide.pdf
    • https://uploads.strikinglycdn.com/files/2c91d9b7-d799-4eb2-a7c7-174dca526828/kipeb.pdf
    • https://uploads.strikinglycdn.com/files/7136b32e-5f80-4a17-9e25-0bd62a4b8dee/99086545965.pdf
    • https://s3.amazonaws.com/wulagisi/arm_curl_test.pdf
    • https://s3.amazonaws.com/liwafo/ancc_nursing_informatics_certification_study_guide.pdf
    • https://s3.amazonaws.com/vavale/unity_streaming_assets_path_android.pdf
    • https://s3.amazonaws.com/tunenijexe/direct_and_reported_speech_ks2_powerpoint.pdf
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_fc3834131c3649dc8314d0108d884421.pdf?index=true
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_97e7eda756b14ab7b3002407d1a4e382.pdf?index=true
    • https://c11ab09e-384c-4904-8c79-5ef6f38008df.filesusr.com/ugd/7131a6_e624da352f60468cb21f098dfb1a615c.pdf?index=true
    • 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_off0000e8e3.bin
00763c6676409bf80f1ab2534bd71b6abc78a44a2f9e779aadbf0f62d574de20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 5116 bytes
font_01_sfnt_off0000fa53.bin
b1cbddff1a8b48a0fcbab928b1c3e62e3249c8ff4544459a4125c71684bfbff8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA53 11744 bytes

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