Malicious PDF — malware analysis report

Static analysis result for SHA-256 021d3d42e40eb054…

MALICIOUS

PDF

72.5 KB Created: 2021-03-07 19:17:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: ce67d89dbb8316290ddc1f3647044edc SHA-1: 1949d9d605239d8f25a952fb07d20bc6bbc8829f SHA-256: 021d3d42e40eb0544c7332c07f74a7304817391b81b7f8b5845029b519c2675d
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 maliciousness. It contains numerous embedded URLs, with one pointing to 'baarspo.ru', suggesting a phishing or malware distribution attempt. The PDF structure and embedded content indicate it functions as a link farm, likely to obfuscate the final malicious destination.

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://baarspo.ru/wix?keyword=words+for+angry PDF link annotation
    • http://naykaryadom.fun/lelurosejujimebuzuvibemruq3p.pdfIn PDF document text
    • http://zumbayuliya.online/91601767168kudfd.pdfIn PDF document text
    • https://cdn.sqhk.co/jekenilegefe/Jjfiehs/8147226206.pdfIn PDF document text
    • http://lozepamubi.iblogger.org/17991116195.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/hZ8spIj/dijapebenolizukaselu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/exercise_physiology_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/xejibapawiriz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/866a5e4a-ddeb-4c83-b6e4-8ce37ba03438/where_can_i_get_my_dog_neutered_cheaply.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eb7907c-9aa3-430c-8bb2-a494a879f47a/troy_bilt_tb685ec_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2ae89fd-0770-4b78-900e-4853dc679832/kadim.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/weight_watchers_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0017dcc9-5e12-452a-b15c-20b6c4fb5fcd/free_christmas_math_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e46c513-dcd1-495d-b8d9-879039511ae7/36768258007.pdfIn PDF document text
    • http://posivunoloreweb.rf.gd/personal_performance_evaluation_template.pdfIn PDF document text
    • http://worined.epizy.com/52347306306.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_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 5156 bytes
SHA-256: ec0e2ba49b3be32273cce8ba497c23b5eaf79f8856b9bc60f80d8cd4686d31ee
font_01_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 10656 bytes
SHA-256: d9ea6db816f4e4c042e36d34089628e7ee90dc442e1f1507ffb5d862a56bc6c3

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