Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d4f432f254a885…

MALICIOUS

PDF

81.0 KB Created: 2021-02-27 00:34:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 714c9dd64dad8bab32a08c87c7cec743 SHA-1: 30d645c33079650109221517e1a6a2f49a88fad2 SHA-256: 27d4f432f254a8858c317be663afdb5bb614069c89b13f3d5eaeb769d0ca9008
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and one specifically lures the user with 'dave ramsey career book recommendations' to a URL that likely serves a second-stage payload. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a link farm designed for malicious purposes.

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://soxebez.ru/aws?utm_term=dave+ramsey+career+book+recommendations PDF link annotation
    • http://thecet.xyz/tftp_server_for_windowsczetg.pdfIn PDF document text
    • http://regsenatvumen.website/rivabuzikudotafarowapanoqlmqg.pdfIn PDF document text
    • https://zaketedojerobi.weebly.com/uploads/1/3/6/0/136023974/peruzonorilasib-lefibut-daligupe.pdfIn PDF document text
    • https://wanezevidika.weebly.com/uploads/1/3/4/5/134588498/dolegomelotiwafudi.pdfIn PDF document text
    • http://legendarycraft.ru/49756450940x140.pdfIn PDF document text
    • http://levantemosaic.com/gefexesatawuxelosj4tx.pdfIn PDF document text
    • http://gelumagiz.iblogger.org/bowoxapokogigisovid.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/3314416.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/oracle_sql_certification_cost_in_india.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://luwefotikejumu.rf.gd/falcon_bms_4.34_u2_download.pdfIn PDF document text
    • http://vibakiwijikilok.rf.gd/fugitojomafuxarepi.pdfIn PDF document text
    • http://fuxalobel.rf.gd/jovurilu.pdfIn PDF document text
    • http://jogekofasi.rf.gd/newoxuzaxotoril.pdfIn PDF document text
    • http://miviguwi.epizy.com/i_love_you_2019_kannada_movie.pdfIn PDF document text
    • http://fakadigat.epizy.com/fapuvatefaletasukovoxo.pdfIn PDF document text
    • http://janaxoz.epizy.com/bluetooth_free_apps.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17F 5208 bytes
SHA-256: b714f764fb00de3ba73ede19765fec25ad427c3182efd1d3f9fe57d767ed6008
font_01_sfnt_off0001032b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 10420 bytes
SHA-256: ea20709b16f5f40af1413f9424ccb5696ec431f22d5d7e1604172e9a3b1e8a19
font_02_sfnt_off000126ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AB 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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