Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbd1fad7968678f…

MALICIOUS

PDF

73.4 KB Created: 2021-04-24 15:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ef6cd13085478d94cb2708e8d62cfd28 SHA-1: d7684c349dd22999625c472df8aa3d40d8ebd0a6 SHA-256: ccbd1fad7968678fc3ae0dd8d4a87e259e890e1be6658b6d0f8ea23273f17eec
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://nipisod.ru/strik?utm_term=hot+spot+spa+not+working PDF link annotation
    • http://retamos.mygamesonline.org/pdf_alternator_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449397/normal_604edd78b4535.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374545/normal_5ffcbb3b5314f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385617/normal_6016d4ac3f072.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/18864711550.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/carrom_board_game_information.pdfIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_29f82881cfc74baa88d432929ffef485.pdf?index=trueIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_36e3e13822a34d63a2ab194c8aec84ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zidenigad/16333029039.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/what_are_latin_words.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_f277ae5353d74f8b910046a616a7a022.pdf?index=trueIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_7d6005f63c9b42a88e98ebaaac8da86e.pdf?index=trueIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_f4de9fdedd0246dcb32713c295837ae4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/examples_of_gatekeeper_genes.pdfIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_2bac06488b804c81b5e366a9a9b8c6f8.pdf?index=trueIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_b473ebddac204ec6a27037c1f0e7c22e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/lisutujapuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/91814694452.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_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 5072 bytes
SHA-256: e4e908fe3762b9e97cc8f1211305633dc8c1cae91e6fa6418d0a3862e51b4ebf
font_01_sfnt_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 10580 bytes
SHA-256: 8fcceef9f5b932276f52301cba5a6ea36bcd505feed75c5cc8df44fbc8aedffc

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