Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ae15d23e9dd889…

MALICIOUS

PDF

79.6 KB Created: 2021-03-16 00:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0244d5acd032b3c244c6db78ff22c543 SHA-1: 49c1311ea38bd423ee6f3659400a3019ea48f635 SHA-256: 54ae15d23e9dd8898ec8d3b6659e9658d0570582da46501830258665cdaeabde
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 suspicious domains, indicating a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM specifically flags this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution by directing users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=sansa+mp3+player+won%2527t+turn+on
    • http://spainwow.pro/vopixifowukododujaxugf49jy.pdf
    • http://help-copyrightviolationhelpcenter.com/how_much_notice_should_i_give_for_a_letter_of_recommendation7laxb.pdf
    • https://ruruzepekasoto.weebly.com/uploads/1/3/4/7/134753799/wobegebaxex_pusovo_xegideb_fomaxaxiguzoneb.pdf
    • http://autocredit.moscow/apsu_rewa_exam_form_2018_last_dateo5ra2.pdf
    • https://vipomumukewa.weebly.com/uploads/1/3/0/8/130813786/nokekinevodug.pdf
    • http://lazadacostumercenter.com/nukefolimufimfc1w.pdf
    • https://defonufagij.weebly.com/uploads/1/3/4/3/134360363/86e3c6e.pdf
    • http://lolkek.xyz/pld_high_school_cheerl1jrm.pdf
    • http://meetchambre.xyz/irregular_past_tense_verbs_list_printableqg6vt.pdf
    • http://biomanix.best/vixirefagakidagupupapile0hbsj.pdf
    • http://lnstagram-helping-centre.com/percy_jackson_new_series_20206xari.pdf
    • https://riwitasaroxaga.weebly.com/uploads/1/3/4/6/134656256/gonizuk.pdf
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/dubowalozunido.pdf
    • http://fumigatoff.online/dymo_letratag_display_problems2nqvv.pdf
    • http://lotsmen.com/952738114773wnul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_731cc4684c2644f78b1cfbbf2d1b43cc.pdf?index=true
    • https://s3.amazonaws.com/liwafo/47544860858.pdf
    • https://s3.amazonaws.com/zifilobesumafi/81937245326.pdf
    • https://uploads.strikinglycdn.com/files/2bf76a27-0381-4387-b595-6789bce9a3e1/36773733279.pdf
    • https://s3.amazonaws.com/tolivajupeku/top_10_south_indian_movies_websites.pdf
    • https://uploads.strikinglycdn.com/files/0e4da6b2-3782-4800-b5c6-301fb6ef9634/darovabaramogad.pdf
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_2b5dcba10f784395b614a97e8729a1d0.pdf?index=true
    • https://9dd02728-8b0e-4c16-8a5b-31b14a6ec887.filesusr.com/ugd/d8c3ed_8e313148b5204f2c8c827563b492b40d.pdf?index=true
    • https://s3.amazonaws.com/godewumazek/medico_legal_report_writing_course.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_off0000f567.bin
d78aee2d0dc5734045670075eb08dddd70f865d7a5de57128cfa80b3bf8676a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 5460 bytes
font_01_sfnt_off000107fd.bin
f319699f8ca8f023eada204f7de3017d6a8ae223cfb45b26ef9dafc8ac0ff8c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 11336 bytes

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