Malicious PDF — malware analysis report

Static analysis result for SHA-256 9367b8bb37dc76f8…

MALICIOUS

PDF

75.8 KB Created: 2021-03-23 17:24:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6500f5d3b6e0319ab7c40f6fc1fc1969 SHA-1: 13504ff9ce1b97097a715c8cfc24835555be45f0 SHA-256: 9367b8bb37dc76f8fef7da490be08509c59d699f2d890678961cd5d6ee43a177
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://dugedepap.ru/strik?utm_term=how+do+you+fill+a+hoover+spinscrub+50 PDF link annotation
    • https://zeruwowigewal.weebly.com/uploads/1/3/0/8/130813736/fizagusobud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367297/normal_60031124aef07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500187/normal_602e00e21fff8.pdfIn PDF document text
    • http://paxazesak.iblogger.org/28061101221.pdfIn PDF document text
    • https://tuxativavowaz.weebly.com/uploads/1/3/1/4/131437956/vuroxazor.pdfIn PDF document text
    • http://kujazudoxiro.22web.org/english_4_textbook_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443356/normal_5fe9c43e1f3f9.pdfIn PDF document text
    • http://zotikarida.medianewsonline.com/asymptote_rules.pdfIn PDF document text
    • http://faxixovojaja.sportsontheweb.net/28122830058.pdfIn PDF document text
    • https://zejikato.weebly.com/uploads/1/3/3/9/133997407/lupapa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470387/normal_604f8f46ecb8b.pdfIn PDF document text
    • https://fiwebafifike.weebly.com/uploads/1/3/4/8/134885554/xipumalofojal.pdfIn PDF document text
    • https://lezuzanufebaj.weebly.com/uploads/1/3/4/8/134873312/5a5d1c36e5209b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://povojenase.rf.gd/android_17_vs_piccolo_theme.pdfIn PDF document text
    • http://luturuwuxas.epizy.com/14588766713.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/gegilerotesetimoziredu.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/45372736102.pdfIn PDF document text
    • http://batitesejikak.epizy.com/dopabebovepenor.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/proportions_similar_figures_word_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/conversion_de_ft3_h_a_m3_h.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_off0000e892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 5864 bytes
SHA-256: a009159816bc335b443894428b84c49a97af0d5060ed926c3766f57eb3479703
font_01_sfnt_off0000fc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 11004 bytes
SHA-256: 30ec079d22bb2354f22ff6b9fda665ff719e397239c268cbb539ef8ab3e623c8