Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e1d0937e891062…

MALICIOUS

PDF

75.1 KB Created: 2021-02-08 08:51:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ab9a899f6b16e22115f3a95a576f7387 SHA-1: 0c052b69323fc4bbd39d07b2fc174b3de0a42f94 SHA-256: 48e1d0937e89106211e2b1e12b4b3343fa7c94c6d770ce2e8de120ea73cd0ee4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users via external resources.

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://baarspo.ru/wb?keyword=zombie%20archery%20survival%20game%20mod%20apk PDF link annotation
    • https://cdn.sqhk.co/vitikitema/hieHkih/study_tips_for_middle_and_high_school_students.pdfIn PDF document text
    • https://raxuzorozejataw.weebly.com/uploads/1/3/4/0/134042373/lorozugutilu.pdfIn PDF document text
    • https://zasawebisev.weebly.com/uploads/1/3/4/8/134865024/1881132.pdfIn PDF document text
    • https://denijebif.weebly.com/uploads/1/3/4/5/134584122/fivukizimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393204/normal_601c05ec61537.pdfIn PDF document text
    • https://zatenumidepav.weebly.com/uploads/1/3/0/7/130776458/lababizidijo-lopoguxujup-migodis-mavipakoger.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/kidexidu.pdfIn PDF document text
    • http://povar2020.site/air_conditioning_principles_and_systems_4th_edition_free_download9eazq.pdfIn PDF document text
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/5359933.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5ff0da2d8bd42.pdfIn PDF document text
    • https://napokepuwaju.weebly.com/uploads/1/3/1/1/131164128/zodezazorula.pdfIn PDF document text
    • https://cdn.sqhk.co/wezupobuwab/gBOTqid/30613136164.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/6M9fjgU/modiribagodude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415291/normal_600abb1252434.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_off0000d8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A1 5504 bytes
SHA-256: 3b98995e218ac3a6d6defe5299e99d6e8f1fa0b8cb38ba31f33eb1140c596f98
font_01_sfnt_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 10936 bytes
SHA-256: 7c876ecaf51df9c51295faf2f8b71e105974fbd8490adc3182c629832e677a16
font_02_sfnt_off000110e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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