Malicious PDF — malware analysis report

Static analysis result for SHA-256 908cb4f67f7d081e…

MALICIOUS

PDF

72.6 KB Created: 2021-02-25 00:58:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 593dea770e104aedecf6988c701b74a9 SHA-1: 5764cea325756c39c83cae50af49c0c244b63b29 SHA-256: 908cb4f67f7d081e0fcc72250f4deb0be85c5f90b54bd7f6ffdc1a00a1b059b0
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=product+management+books+for+beginners PDF link annotation
    • https://cdn.sqhk.co/dixejetafap/vliglie/supercut_hair_salon_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovebakeb/aPnibge/temple_run_game_download_apk_uptodown.pdfIn PDF document text
    • http://gusudula.iblogger.org/67271831318.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/is_m65_field_jacket_waterproof.pdfIn PDF document text
    • http://newuwedeza.mypressonline.com/77258880756.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/a_la_recherche_du_temps_perdu_proust_commentaire.pdfIn PDF document text
    • http://bbcua.site/415695939358mhgo.pdfIn PDF document text
    • https://cdn.sqhk.co/wetilusogaki/jhghGii/41491969358.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/howls_moving_castle_wallpaper_engine.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/ZhbOij5/88470810583.pdfIn PDF document text
    • http://vebilodugisugod.iblogger.org/28800522708.pdfIn PDF document text
    • https://cdn.sqhk.co/foseziwate/jdhaskc/kafekadira.pdfIn PDF document text
    • http://bigonetudukori.iblogger.org/principles_of_power_electronics_kassakian_download.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/66881233266.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zikenonuto.epizy.com/51429319278.pdfIn PDF document text
    • http://kawuduzan.rf.gd/xiwinefiwimakofebekuf.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_off0000df27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 5516 bytes
SHA-256: 528ae6f4570df3d0679504b6b3f08fc59531aff02b469ddcb30cb6ecfdfd5458
font_01_sfnt_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 10364 bytes
SHA-256: 9204748271b0fdd1a2768477441a52fb8a94b5a75f0ba432173cb0d7424a82d7

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