Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aff320127f15a48…

MALICIOUS

PDF

76.0 KB Created: 2021-03-18 03:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ca5d93e35a3907ea8dc173e545cf900c SHA-1: c20afdba62c4ca5d848723fccef1bad51c7a5e06 SHA-256: 4aff320127f15a4895ddf37e486a5fe483288bcde9d313b43711d2e5c12fc524
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xajibur.ru/wix?keyword=family+medical+leave+guidelines PDF link annotation
    • http://vujurilulob.22web.org/kirazulopixelemoxuxu.pdfIn PDF document text
    • https://cdn.sqhk.co/wapuwozelob/Uge4idH/26827088025.pdfIn PDF document text
    • http://lukufogud.getenjoyment.net/mukixakiboti.pdfIn PDF document text
    • http://kezekimoridim.22web.org/vekiralakijusum.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/e0Zvjb6/45637243705.pdfIn PDF document text
    • http://rebibedo.mywebcommunity.org/interior_design_assistant_jobs_san_diego.pdfIn PDF document text
    • http://sawalaxal.66ghz.com/43816602135.pdfIn PDF document text
    • https://cdn.sqhk.co/mamuxejoxe/oijhjJj/sudoku_200_puzzles_medium_to_hard.pdfIn PDF document text
    • http://muvibigi.22web.org/pokemon_alpha_sapphire_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/zupololano/l1lWfje/mow_zombies_camp.pdfIn PDF document text
    • http://wotasabe.22web.org/panutodakikewetusa.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/oral-b_1000_vs_1500_vs_3000.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/47159036156.pdfIn PDF document text
    • http://kunewalijaxuna.getenjoyment.net/mexazubemabajegepapa.pdfIn PDF document text
    • https://cdn.sqhk.co/zavonufovi/bwgfzia/woxidijagif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wovefekekixuji.rf.gd/bombsquad_apk_mod_latest.pdfIn PDF document text
    • http://gagisejokunego.rf.gd/soxawuragezenimawasanis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf7b879-3d58-40a9-a64c-fb479299350d/leluwev.pdfIn PDF document text
    • http://kewumexor.epizy.com/dazzle_dota_1_guide.pdfIn PDF document text
    • http://zekovulelopur.epizy.com/domaguvenopuxaxini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/526a6c6c-9eb7-4b73-82be-df4dc4a6852f/the_sufi_book_of_life.pdfIn PDF document text
    • http://valamujunitun.epizy.com/kugiwufum.pdfIn PDF document text
    • http://fofifalog.rf.gd/51626146216.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_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 5280 bytes
SHA-256: 1edaa78f395ca00dfd8b7091b056ec7662bdf9a0b835fe1cd64bb8293f805eb7
font_01_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 10292 bytes
SHA-256: 8d987d69d2569d1204f1ccb5495f05bd6e3b29d42e100249663a81c1f3693e9f

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