Malicious PDF — malware analysis report

Static analysis result for SHA-256 7666d6ef839e5db3…

MALICIOUS

PDF

74.3 KB Created: 2021-03-27 21:53:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5ab62f15e1ad7de2e6fc57dd3256571d SHA-1: 12c1b3827601adb368cf372051168c98f5bebd17 SHA-256: 7666d6ef839e5db3a7bf7262a42529a28f7ba78179ec5bae47a72cdc484e41c1
186 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 0.9999

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/strik?utm_term=driver+acer+aspire+one+722+windows+xp+sp3 PDF link annotation
    • https://tifevijokob.weebly.com/uploads/1/3/5/3/135351552/tabemazub-bifemagaxa-zovujibokasim-nijagerup.pdfIn PDF document text
    • http://titanof-filtr.ru/mastercraft_tires_cxt_285_70r17cdz5p.pdfIn PDF document text
    • http://natorg.fun/love_story_lyrics_in_roman_englishn521r.pdfIn PDF document text
    • http://copyrightproblem.com/dd_3.5_underdarkbz7ac.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/supewazagisoful_zusuvunapam_jimaki_wusetalewide.pdfIn PDF document text
    • https://pogosarixuxa.weebly.com/uploads/1/3/0/7/130776079/tewewa.pdfIn PDF document text
    • http://islta.fun/54296548271wm350.pdfIn PDF document text
    • https://kugibunil.weebly.com/uploads/1/3/1/4/131437599/5016402.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bimejevitugera.epizy.com/queen_and_slim_script.pdfIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_5a2963deb90c412d8fdbe7da02b39be0.pdf?index=trueIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_84eb11a7d78b4b2784df749500a6c192.pdf?index=trueIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_27533869c57d446988efe5f14455b8bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/25642745315.pdfIn PDF document text
    • http://lofukikusi.epizy.com/38488993596.pdfIn PDF document text
    • https://c38d9960-f3a4-46a0-b266-cfc7836dd0ed.filesusr.com/ugd/a8d9c8_7a77347de1ff4b83b51b4bf93b547cda.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zasepo/sap_users_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97453116-7f65-4e7a-9272-04890f97be5b/49877583007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e0fffe-1571-411b-905f-1f02877c6826/resumen_veinte_poemas_de_amor_y_una_cancin_desesperada.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_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 5632 bytes
SHA-256: 826046b95b01d91f4c7effb9004c7fe749460b8ba843e5319169708b2d286262
font_01_sfnt_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 11144 bytes
SHA-256: 8ccff21874cba22d8f052766c86ba9cb064a529bb7813b99229d116d9698c76d

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