Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff595dc29aeaa282…

MALICIOUS

PDF

82.2 KB Created: 2021-02-21 17:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c8fe2c635a04c0d11b8dfc22e1a8f96f SHA-1: b1875f39828e1d3587107fc1f75dbb35d69f2e75 SHA-256: ff595dc29aeaa282aeb5590d37c95f7b68e6d857c3f8f33387b074fee448758b
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and form a link farm, suggesting a phishing or credential harvesting attempt. The document body, though heavily obfuscated, contains keywords related to forms and downloads, aligning with the 'SE_DOWNLOAD_BUTTON' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/wix?keyword=starfinder+character+sheet+form+fillable PDF link annotation
    • http://modebedunizux.iblogger.org/bunny_nose_and_mouth_template.pdfIn PDF document text
    • https://daxixulo.weebly.com/uploads/1/3/1/0/131070202/7373602.pdfIn PDF document text
    • http://tapovapusewirol.iblogger.org/bulandiyan_hardeep_grewal_mp4.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://remofexemuja.rf.gd/transunion_free_credit._report.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/what_kind_of_charger_does_beats_solo_3_use.pdfIn PDF document text
    • http://pogitijerilux.epizy.com/mapreduce_framework.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/weather_report_of_dum_dum_kolkata.pdfIn PDF document text
    • http://rubidolad.epizy.com/free_professional_cv_template_doc.pdfIn PDF document text
    • http://zukusuvajijip.epizy.com/lefupeke.pdfIn PDF document text
    • http://bazogojuzularib.rf.gd/fitusejovokere.pdfIn PDF document text
    • http://pufupivati.epizy.com/esma_guidelines_aifm_delegation.pdfIn PDF document text
    • http://vitafunajubala.rf.gd/mabaposinuk.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_off0000f950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 5292 bytes
SHA-256: d37f76b5c971b5c010a7d410b18cd5eecb2446c81810b955bc3e40fa796d6be0
font_01_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 10116 bytes
SHA-256: f1f74fb60ee91020bdb9c90b72b069bccd2e65230b95dfea2c630384b6e7c0e3
font_02_sfnt_off00012d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D93 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176