Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c4fc5638a90660…

MALICIOUS

PDF

76.6 KB Created: 2021-03-01 09:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 5f705304700e466515ee3db18fd09de2 SHA-1: 86d5587430419af69595992116b8f5045d7c0e08 SHA-256: 73c4fc5638a90660a6809913b17e3c35f3dbfc3790c4f1138daef9a53747267d
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for SEO spam or to host phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://maypoin.ru/wix?keyword=angry+assignments+mythic+ny%2527alotha PDF link annotation
    • http://rebelliona.online/civ_6_gathering_storm_germany_guideu5v1r.pdfIn PDF document text
    • https://nufapapezo.weebly.com/uploads/1/3/0/9/130969462/movanezesa.pdfIn PDF document text
    • http://tuwukadinem.mygamesonline.org/the_mortal_instruments_city_of_ashes_movie_online.pdfIn PDF document text
    • http://ogranicbio.space/16898656015017rd.pdfIn PDF document text
    • https://kafowuvipuv.weebly.com/uploads/1/3/4/3/134337110/vasumawutujes.pdfIn PDF document text
    • http://tumbaa.space/jio_phone_browser_video_songic8fu.pdfIn PDF document text
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/6277357.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/rhyming_dictionary_for_kids.pdfIn PDF document text
    • https://sizutipaji.weebly.com/uploads/1/3/2/3/132303075/891119c9a1f.pdfIn PDF document text
    • https://madajeguruxe.weebly.com/uploads/1/3/4/3/134348767/saruzeru_vurorojon_tikififelizuzan.pdfIn PDF document text
    • https://novebeze.weebly.com/uploads/1/3/3/9/133997241/6fc1d04b12c129d.pdfIn PDF document text
    • https://webuwoterin.weebly.com/uploads/1/3/4/5/134589655/7806718.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/llewellyn_set_dark_souls_2.pdfIn PDF document text
    • http://otomail.business/nordictrack_t5.3_specshbb8v.pdfIn PDF document text
    • https://vizodejow.weebly.com/uploads/1/3/4/3/134356937/1288839.pdfIn PDF document text
    • https://nopuwilimo.weebly.com/uploads/1/3/4/4/134490360/166d50d6f.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://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_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 5128 bytes
SHA-256: 007f99ee8c7a638526dc55d09225badfe42c0c7655bad86b0725cfa05e50ead2
font_01_sfnt_off0000f473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 10256 bytes
SHA-256: a7d9e7c732568cdbed6c595b849513af8ae0ced1b5540ccd7aee8a23fcdb293b
font_02_sfnt_off00011793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11793 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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