Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ede165bcc949c4f…

MALICIOUS

PDF

88.8 KB Created: 2021-05-15 16:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5bbdfb3e64be91a47e5aaa1f00b18bca SHA-1: aefabb9fdc05890aea29b4aa5fca67b706208513 SHA-256: 7ede165bcc949c4f90c90c1505726772bdb97b44b441458d80adb7b9d2970307
126 Risk Score

Malware Insights

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

The file is a PDF containing multiple embedded URLs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The document body, though partially garbled, suggests a lure related to personality types, which is likely a pretext to drive users to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=personality+plus+types+explained PDF link annotation
    • http://clyb-wylcan3.space/loving_vs_virginia_book49uvo.pdfIn PDF document text
    • http://4bochki.ru/how_to_nail_a_competency_based_interviewjekpr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467306/normal_605c4a271ad53.pdfIn PDF document text
    • http://sesulede.iblogger.org/dofulisibi.pdfIn PDF document text
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/jakadekedo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_60545555e8bac.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/21505972931.pdfIn PDF document text
    • http://nuzidixiwetor.22web.org/kista_ateroma_adalah.pdfIn PDF document text
    • http://fajiragudabega.iblogger.org/lymphatic_drainage_of_head_and_neck.pdfIn PDF document text
    • http://keto-s1.com/fupuxipudjhy.pdfIn PDF document text
    • https://dixaxotobaba.weebly.com/uploads/1/3/4/3/134377978/woganopitopipopixiro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460465/normal_603a7b8a61f81.pdfIn PDF document text
    • https://jidobatixinel.weebly.com/uploads/1/3/4/7/134726111/siren.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5fdc4d9449917.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vobozezojip.onlinewebshop.net/diagnstico_laboratorial_da_anemia_falciforme.pdfIn PDF document text
    • http://tewilojejesuj.epizy.com/lefavib.pdfIn PDF document text
    • http://nafufejuk.rf.gd/sustainable_development_goals_list_upsc.pdfIn PDF document text
    • http://lukafimagog.atwebpages.com/36546539313.pdfIn PDF document text
    • http://fefeseriwumasu.rf.gd/animasi_bergerak_untuk_powerpoint_gif.pdfIn PDF document text
    • http://vomonulesew.rf.gd/24124660721.pdfIn PDF document text
    • http://fewetero.epizy.com/simple_vehicle_bill_of_sale_template.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_off00011d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 5124 bytes
SHA-256: 282cfa8122b7eac7ff21f2b6c652265facb27973013765a18f7f230a72db8f75
font_01_sfnt_off00012e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8F 11112 bytes
SHA-256: e86f832b36be34a1251fdea23227307f0bf30a545de6cbf28a7af9eafb745136

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