Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c75be53eaca285b…

MALICIOUS

PDF

83.5 KB Created: 2021-02-16 16:38:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4d312edfd7aa49d13805024726c9b27e SHA-1: ef992bb14c23329c72a184aa223ea9f344a6ccdd SHA-256: 0c75be53eaca285b0dbc0b8255ba10b9eae6114969b089fe61c7c63a1e381dbd
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with several pointing to potentially malicious domains and one specifically referencing a textbook lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to manipulate search results, further indicating a malicious intent to redirect users to 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://druttle.ru/wix?keyword=9th+class+physical+science+textbook+telugu+medium PDF link annotation
    • http://pinerapidsrr.com/witosofifiwakefanodosec4ca2.pdfIn PDF document text
    • https://cdn.sqhk.co/xeliwiwogivo/rMiijig/bella_vista_golf_course.pdfIn PDF document text
    • https://cdn.sqhk.co/sutadejuna/hdaigfw/welelexixirupibiminujewev.pdfIn PDF document text
    • https://risogaruwakev.weebly.com/uploads/1/3/4/6/134634919/wagipovafotu.pdfIn PDF document text
    • http://strahuemsya.info/film_1anunnaki_sub_indop9jsu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417025/normal_600653cb60b84.pdfIn PDF document text
    • http://esmoney.site/stem_cells_breast_cancerd6qf8.pdfIn PDF document text
    • https://cdn.sqhk.co/lanasido/bibTiiR/samsung_clp_310n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460944/normal_5fd27a28660d8.pdfIn PDF document text
    • http://xitnet.fun/notuf9z7ld.pdfIn PDF document text
    • https://mefosenide.weebly.com/uploads/1/3/4/7/134715399/5055791.pdfIn PDF document text
    • http://epipog.com/15892402037ybmpv.pdfIn PDF document text
    • https://sokuvefababadax.weebly.com/uploads/1/3/1/8/131856373/bf5d477.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415327/normal_6000198ab7818.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/branches_of_government_worksheet_middle_school5950u.pdfIn PDF document text
    • http://sparzha.club/wigabiwojowuzamafalat5rqjz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/bookworm_adventures_popcap.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/aanewala_pal_song_free.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_off0000c8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C4 5824 bytes
SHA-256: 42c5c672b2ba11df07634ae01e3d12565030ae81569eed8bbd4b7dd972e0e221
font_01_sfnt_off0000dc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC76 29720 bytes
SHA-256: 82fd4dd18e69e60685605c454907f7c27a9199600d4f2ebfd31201562cbbba02
font_02_sfnt_off00011d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 10084 bytes
SHA-256: 7eeb1afd5cbd6b4873b91e61c427f8ba5d5331a8b8700ce684c6420aac177a40

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