Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd93d0aae1dc0da…

MALICIOUS

PDF

78.8 KB Created: 2021-03-03 06:44:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f5b460686f0124a5036a3b4f24c11eb4 SHA-1: 3461a5764dfdfc54ef59173a3caccb94b9395353 SHA-256: abd93d0aae1dc0da60c66cf4d635ca15732398ddb34755cc3ca6e5934b8c053a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence suggest a malicious intent to redirect users to potentially harmful content.

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://seumenha.ru/aws?utm_term=will+sao+season+4+be+on+netflix PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450890/normal_5ffe860ba7d4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_600d115b61642.pdfIn PDF document text
    • http://xiledokujajipo.22web.org/67317710346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_60322eb4c27fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415334/normal_5fde6659ab7a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388169/normal_5fe392a03ad4a.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/Khhhaib/xotexibanejosan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425484/normal_601fe31347677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485166/normal_601a822a16d73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393189/normal_5ff663277e94e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446923/normal_603bbfd5155e7.pdfIn PDF document text
    • http://fridgeservice.ru/58471655925htw9p.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://nivunurawusaxo.rf.gd/mawlid_barzanji_arabic.pdfIn PDF document text
    • http://gurevetafajes.epizy.com/69454831062.pdfIn PDF document text
    • http://ginisanekuxowo.epizy.com/which_of_the_following_was_an_obstacle_to_progress_in_russia_in_the_1800s.pdfIn PDF document text
    • http://podapuleleg.epizy.com/wajuzenav.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_off0000eb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 4760 bytes
SHA-256: 8f4933364fcb56444939dea74c93309004f648560c6eff8caf0f7d7ccde97fdd
font_01_sfnt_off0000fb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB69 10548 bytes
SHA-256: aed0301056ca56e48a73cdb55aa5568531945d45fad136bc4ddc44ff66e0d293
font_02_sfnt_off00011f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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