Malicious PDF — malware analysis report

Static analysis result for SHA-256 764d8ebc8c6e1df4…

MALICIOUS

PDF

74.6 KB Created: 2021-04-02 18:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c1af482fb9ab17230454dcdd44a9bbc SHA-1: 7bb8454e4f81e52b5b88d1aa6089e4a72c749b1a SHA-256: 764d8ebc8c6e1df4cd7813dd8ef3b4977c06cd24cbf5e058506384cb0abdc836
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to seemingly unrelated documents, suggesting a link farm or SEO poisoning tactic. One of the primary URLs, 'https://resalured.ru/strik?utm_term=introduction+to+law+for+paralegals+3rd+edition', is directly associated with the malicious detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=introduction+to+law+for+paralegals+3rd+edition
    • https://lewibodozibepa.weebly.com/uploads/1/3/3/9/133997785/64a106e7ea1.pdf
    • http://jonipifenukiz.mygamesonline.org/capture_one_11_tutorial.pdf
    • https://xugimitedekilim.weebly.com/uploads/1/3/1/4/131482884/bilepud.pdf
    • http://pogawubujogeje.mypressonline.com/historical_atlas_of_the_islamic_world_david_nicolle.pdf
    • https://zowajapizuxazo.weebly.com/uploads/1/3/0/9/130969341/79b0209a.pdf
    • http://sijubuwejipamun.mywebcommunity.org/wopapeg.pdf
    • http://ludesajezopaju.medianewsonline.com/42240613770.pdf
    • https://nomabedipami.weebly.com/uploads/1/3/1/4/131437379/7015782.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nabifovu/rukegil.pdf
    • https://s3.amazonaws.com/mejifavo/63877439120.pdf
    • https://s3.amazonaws.com/fobupojowojon/allegations_and_mixtures_problems.pdf
    • https://uploads.strikinglycdn.com/files/ccf636f0-f48e-40a9-9597-b6a1421704e3/how_to_replace_the_chain_on_a_remington_chainsaw.pdf
    • https://uploads.strikinglycdn.com/files/d6afeea0-7c5d-43bd-a2c3-93cc22a025b0/sowewelabuz.pdf
    • https://uploads.strikinglycdn.com/files/954a3538-3e31-4900-94b4-bce821de4521/what_are_the_types_of_zodiac_signs.pdf
    • http://dirulibas.onlinewebshop.net/36947283164.pdf
    • https://uploads.strikinglycdn.com/files/4d9d6e4f-39dd-4d31-8088-892c76989f5e/chick_fil_a_online_application.pdf
    • http://jawomutiz.epizy.com/pros_and_cons_of_charismatic_leadership.pdf
    • https://s3.amazonaws.com/vukujidor/61386104871.pdf
    • https://uploads.strikinglycdn.com/files/8b58038e-5efc-4c30-8d97-7ff908aa7302/vogerezobejozusup.pdf
    • https://s3.amazonaws.com/jalasilunaz/circle_area_worksheet_answer_key.pdf
    • http://xofawuriduk.epizy.com/34763756957.pdf
    • 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_off0000e3dd.bin
e8561d68e6a76f58f723c6a11dcc4bf29e458675f36488c47341b24fe19761ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 5516 bytes
font_01_sfnt_off0000f6c3.bin
7f360bf8f7fa56dcba0604dd3dd2214833c2f310a6a636b6584dcfbcd2fc0fc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 11252 bytes

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