Malicious PDF — malware analysis report

Static analysis result for SHA-256 7755c483dee2ae31…

MALICIOUS

PDF

88.6 KB Created: 2021-03-05 04:03:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 809f5a80a0845ce9836f1e3f269bc01c SHA-1: f2cbf4bc65ea07ba687e59d7c5278a89164abb41 SHA-256: 7755c483dee2ae3103c1deeb12168303e321a84702d3181febcd3fed9b944eee
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL pointing to a site that appears to be a link farm designed to mimic a search result for a product query. This suggests an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/award?keyword=is+porter+cable+a+good+brand+of+power+tools PDF link annotation
    • http://bewewafip.scienceontheweb.net/monster_vs_aliens_episode_11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470014/normal_602d6874061a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453326/normal_603a52b4c4229.pdfIn PDF document text
    • http://bixaxivajujojar.mypressonline.com/lenovo_t420_laptop_adapter.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/lg_4g_lte_hard_reset.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489586/normal_5fdbd0eccd2cb.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/66127596849.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454055/normal_5fdf0192a01ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_6035d6217bb53.pdfIn PDF document text
    • http://ligumexijigab.getenjoyment.net/essay_for_grade_6_students.pdfIn PDF document text
    • http://bijatutolime.iblogger.org/japan_2016_criminal_justice_system_reform.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_5fda1f827e6da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485156/normal_603a449d558ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460477/normal_601863f17c6e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410414/normal_601dc6d56e725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388614/normal_601059d1df6f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guwaxilajoxeza.onlinewebshop.net/20414913096.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/56482587885.pdfIn PDF document text
    • http://pixutixiziv.epizy.com/92230117378.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_off000120af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AF 5492 bytes
SHA-256: a48c75c270c5e8ca61d24ce41395a87d76ecaded98dc47aa246c15f47f06ac72
font_01_sfnt_off00013379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13379 10184 bytes
SHA-256: 13aa9a1bf8a487c882e2ba6356a7e3badd2f4692da2f86236e782ae33e92266d

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