Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c5fa752ceb33c3…

MALICIOUS

PDF

97.1 KB Created: 2021-02-20 04:14:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 615fa14b22b5f8e2ed320dc2b31e44b6 SHA-1: 74e3febd41f6cd3f739c41742da90cdcb7212ae2 SHA-256: f8c5fa752ceb33c319a04641b2ef7e94c8a149d581144e00bf714f6f6229e5d2
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 or link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to strategic planning examples, likely to entice clicks on the embedded links.

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://jottigo.ru/strik?utm_term=planeaci%25C3%25B3n+estrat%25C3%25A9gica+t%25C3%25A1ctica+y+operativa+ejemplos PDF link annotation
    • https://mimevomakiket.weebly.com/uploads/1/3/4/6/134693464/3c5169f.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/8cfc350.pdfIn PDF document text
    • http://summ-ita.space/backup_android_contacts_to_pc_via_usb5gpil.pdfIn PDF document text
    • http://kegujusotuk.iblogger.org/60822109467.pdfIn PDF document text
    • http://fujuvujazapoko.22web.org/itunes_microsoft_store.pdfIn PDF document text
    • http://sunshop.pro/clue_scroll_hard_maps_runescapeit3w4.pdfIn PDF document text
    • http://reduslim-siteofficial.site/gobavul1wyd.pdfIn PDF document text
    • http://ladukusuga.22web.org/curriculum_vitae_template_english_word.pdfIn PDF document text
    • http://fruktovik.com/5_love_languages_explained8w2of.pdfIn PDF document text
    • https://wedikeme.weebly.com/uploads/1/3/1/6/131606111/putepajuxux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lubuzasoxevixan.epizy.com/xofekijipediximumemi.pdfIn PDF document text
    • http://mupegutiwigo.epizy.com/31736496671.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_off000139be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BE 6004 bytes
SHA-256: 8e29395c03376b63f5fa146be65ec0dbe375fe0844f2565f86998081f424ba37
font_01_sfnt_off00014d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0F 12412 bytes
SHA-256: 7a0b228eeac68d02540867f75cd47f8bfed1c5b6527e80d7844f526e9ee76a42

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