Malicious PDF — malware analysis report

Static analysis result for SHA-256 877e863ab42111ac…

MALICIOUS

PDF

82.3 KB Created: 2021-03-03 20:53:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f838bccbc4de67fd7131dc257e63037e SHA-1: 837f82c75075739c36d60dc6f50c10a492970257 SHA-256: 877e863ab42111acbb1a2ea606cbcd4ff3e408c21f8e5cef73ede867686a6745
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one prominent external URI pointing to 'golowaki.ru', suggesting a phishing or malware distribution lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=what+is+the+structure+of+the+song+killer+queen PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368742/normal_6000f649f30bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368998/normal_6025e3438e015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448995/normal_603ec85b0c96e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450036/normal_5fc800322477d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_5fd79a6f5999e.pdfIn PDF document text
    • https://mibajajezek.weebly.com/uploads/1/3/4/0/134017497/bokokunawuki_petegumidivaxis_parulunesazopo_kosiwinam.pdfIn PDF document text
    • https://liroxinumapidaz.weebly.com/uploads/1/3/5/3/135348088/padimivaf-samek.pdfIn PDF document text
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/fuzovolekibilejamiti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425760/normal_5fce6573c3a4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469630/normal_602e8565617ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496374/normal_5ff4cec0902ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384468/normal_60186841116fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494868/normal_600ae6bbdbfe9.pdfIn PDF document text
    • https://fuzurisef.weebly.com/uploads/1/3/4/3/134369427/merikitexiw-fesuwoke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403687/normal_5ff98c0b043a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366028/normal_5ffb5d022955b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bujitajaxo.epizy.com/reservation_form_hotel_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/adb_install_apk_waiting_for_device.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_off000104e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E1 5348 bytes
SHA-256: f50a17219e80541f53a3d2cc7166e9bb2ca16b6db1de893b708f2bee52b8dd9e
font_01_sfnt_off00011715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11715 10804 bytes
SHA-256: 99a0081e286c8c24bc002b70cd41deb6c14a8b8e0bd3ec61f925deb4d835f2c0

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