Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ed57fc58da7d0a…

MALICIOUS

PDF

77.9 KB Created: 2021-02-26 04:41:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d8bb7fd68ecefaa93f4c0d0a9de5c3d8 SHA-1: e57b610a181809943060ae2603970c3798fe7de1 SHA-256: a2ed57fc58da7d0adeae9bfb99447e0cd55b4b834f038b2303a3a925f896b31d
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm and a fake invoice lure. The embedded URL `https://baarspo.ru/strik?utm_term=buy+nj+transit+bus+tickets+online` suggests a phishing attempt related to purchasing tickets. The presence of numerous disposable domains and link farms further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/strik?utm_term=buy+nj+transit+bus+tickets+online PDF link annotation
    • https://cdn.sqhk.co/zejizoguzut/athjCgf/1768379509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402262/normal_60379dc70f4c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447085/normal_602d854131555.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/netters_anatomy_flash_cards_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_601a4968f071e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455399/normal_5fd7c3273f8f9.pdfIn PDF document text
    • https://cdn.sqhk.co/salavogi/shh5mjb/zelekamuwipezezowe.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/algebra_nation_section_5_topic_9_answers.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/management_information_systems.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371788/normal_5ff183872feb0.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://vulitogegitutop.rf.gd/2281690849.pdfIn PDF document text
    • http://rakojumetaxo.epizy.com/3661643972.pdfIn PDF document text
    • http://seguwogira.rf.gd/86365597744.pdfIn PDF document text
    • http://dibogazosenu.epizy.com/bgrs_guide_login.pdfIn PDF document text
    • http://lowazuxakosilal.epizy.com/giradiva.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 5108 bytes
SHA-256: 7e8c2db6f014886d9c2b4200fbe7e443536d54418165c4c43f6e5179eaaa78a4
font_01_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 11200 bytes
SHA-256: 3abb341e35d0ee58d3427fbb0df01b7c79bd6d813cb47f5b85be62a1ce76af5c
font_02_sfnt_off00011a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A81 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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