Malicious PDF — malware analysis report

Static analysis result for SHA-256 d988f705bfe17a6a…

MALICIOUS

PDF

107.6 KB Created: 2021-02-27 09:52:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e3f8350d76870ee5e41f06477501c1be SHA-1: 74f62238a642717273531fe45dd499f688d97bda SHA-256: d988f705bfe17a6a2285d1e2b64373a0b218a4b01b644fb5e6e3eca5d725b0cc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the PDF structure and numerous external URLs point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=como+planear+un+taller+de+capacitacion PDF link annotation
    • http://rijepesejib.22web.org/40011470283.pdfIn PDF document text
    • http://uaportal.site/57987565465tw7cc.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/how_to_cancel_call_forwarding_on_landline.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/mhgiggc/monkey_grass_blackberries.pdfIn PDF document text
    • http://zelopaqq.xyz/jitifozimrf42.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/ibnifgc/freeze_pumpkin_pie_baked.pdfIn PDF document text
    • http://nikecortez.net/580665643298cmpz.pdfIn PDF document text
    • http://1s.london/walmart_ps5_restock_date_canada1ztmz.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/USPi6on/midugunid.pdfIn PDF document text
    • https://cdn.sqhk.co/deguxikezu/dhjgf2T/64373296593.pdfIn PDF document text
    • http://meetdouche.xyz/xevotoxisa6dce6.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/que_es_relevancia_en_diccionario.pdfIn PDF document text
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/8974601.pdfIn PDF document text
    • https://cdn.sqhk.co/pivugisaxap/Jja94GU/marvel_hero_tales_spider_man.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kamabutexukawiv.rf.gd/colorectal_cancer_screening_guidelines_ontario.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_off00016877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16877 4948 bytes
SHA-256: 95d88a6558924c71a9460acc222524739e537d52b56ba5f96c0de36f02140ef4
font_01_sfnt_off0001792c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1792C 11808 bytes
SHA-256: bfe78762d0b9706e601eb0287137c7d8588acca1f9f59d902653b891215adbbc

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