Malicious PDF — malware analysis report

Static analysis result for SHA-256 8661b21111d26fed…

MALICIOUS

PDF

65.8 KB Created: 2020-11-18 05:34:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3d484d61c6b955579c3c1c6b89fe5413 SHA-1: b87e23b7faf7bbf547e47d0df33a55c6ac2cf51a SHA-256: 8661b21111d26fedbefdb2239de49b238c4ad0b5464ffab45880d8dfd4cda9ae
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, indicating a link farm designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

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://trafficel.ru/strik?utm_term=cassiane+com+muito+louvor+letra PDF link annotation
    • https://zozesikijep.weebly.com/uploads/1/3/4/5/134586683/vowawo-kenujerakosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414687/normal_5f97ce98eda3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427086/normal_5fabcf2e34dc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_5f8db3a6e2c98.pdfIn PDF document text
    • https://baxojozejaxofo.weebly.com/uploads/1/3/4/5/134586757/3ca97da30c303.pdfIn PDF document text
    • https://lexebemo.weebly.com/uploads/1/3/4/3/134315688/pudovowuwetit.pdfIn PDF document text
    • https://jaxirifaru.weebly.com/uploads/1/3/4/5/134500995/mojemunob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b6630bb-4359-4340-bf18-d34e4a4adef8/descargar_mix_los_bukis_viejitas_per.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ecc1b30-2bde-4c60-a952-153664d59d5e/a_midsummer_night27_s_dream_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a5952c6-933e-4e68-9f0a-488b5c71280a/novagojogupezuderetiso.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/car_uk_magazine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ac6b29-21d5-454c-9999-79ba39949efa/23486938074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b98ff74-d16a-4fbe-b707-3cb068006d56/doodle_free_meeting_scheduler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43ab60a1-62ff-409f-ae46-bafbb6d3be60/wibad.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB927 4912 bytes
SHA-256: 5152b2e050c342348d91a3b09dc1c143a86aceef69aea40dcc7a5b95e63b8ab3
font_01_sfnt_off0000c9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BD 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off0000d51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51F 11792 bytes
SHA-256: 6013865ab3fa1099ba7b10c06c0b351d0ea86ae3677c92c96414a3bc85fe6b24

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