Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a8def3ee5e4130…

MALICIOUS

PDF

83.0 KB Created: 2021-03-20 05:37:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01e1cd2868fe3e6f0c0069eedf666729 SHA-1: 982e11f2491db19b7176efa5d7e76a0932a61b8e SHA-256: 13a8def3ee5e413077da713f1831091a6a411f998d024cfe2427b4a4f20cc3d8
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one prominent URL pointing to a domain associated with link farming and potentially phishing or malware distribution. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content.

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 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://resalured.ru/wix?keyword=nikon+manual+aperture+lens+%2528%2527d%2527+series%2529
    • http://pojibuvuj.mygamesonline.org/blitzscaling_download_free.pdf
    • http://mukifufiri.iblogger.org/semblance_jay_musically.pdf
    • http://itnegozio.info/62300005261q9pc3.pdf
    • http://subfamjtii.site/16194285128bq2kk.pdf
    • http://bodipok.getenjoyment.net/best_book_to_learn_korean_for_beginners.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dusameferadulo.onlinewebshop.net/jexejabuvarakaxifidif.pdf
    • http://likewiwojuxus.atwebpages.com/origami_box_out_of_a4_paper.pdf
    • https://uploads.strikinglycdn.com/files/53d97429-ee22-4edf-97e6-ba6f8695d307/30227224503.pdf
    • http://nabenejajoko.myartsonline.com/annamacharya_keerthanalu_lyrics.pdf
    • https://uploads.strikinglycdn.com/files/431b99da-e73f-4f5b-89fa-9daf5a105627/xabiwivamise.pdf
    • https://s3.amazonaws.com/zagubip/chadariya_jheeni_re_jheeni_song_free.pdf
    • http://gojaxuga.epizy.com/tokyo_guidelines_for_cholecystitis.pdf
    • http://rowagaparik.rf.gd/pukuvabaxadojigokeleke.pdf
    • https://s3.amazonaws.com/xopugup/craftsman_lt1000_starter_gear.pdf
    • http://duxuramubot.epizy.com/gukibuvivalewu.pdf
    • https://uploads.strikinglycdn.com/files/0fdb1c96-ffb0-4a8d-9f69-a69728b733bc/57756982311.pdf
    • https://s3.amazonaws.com/belopudevuzuza/flute_notes_sheet_music.pdf
    • http://suzifoki.myartsonline.com/mebakufixuseriraregani.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_off000108fc.bin
d06d7dc489564153d62ab97193284717747b569e5a869dbaf90c9e584cad44b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 5324 bytes
font_01_sfnt_off00011b14.bin
00f9623f4195fafebb3790a1573f6db73eed913b4710edef0bb137a1fdbe0aaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 10412 bytes

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