Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb458eb9637bf4c…

MALICIOUS

PDF

91.2 KB Created: 2021-03-24 12:16:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ef6aa31262c3c5dd3087ebf14ec50b31 SHA-1: 28b9cf0f0ea7e03a25f0ac5420a8c4777d6bcbe0 SHA-256: 9eb458eb9637bf4cb5505433719673bca55890e93f8fe969e7fe0281370e3ecd
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to exploit user trust by masquerading as useful content like exam answers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/123?utm_term=netacad+chapter+10+exam+answers+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415769/normal_602196ef4676a.pdfIn PDF document text
    • https://cdn.sqhk.co/jofutagi/jickiYv/amazon_photo_albums_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/gqghjiI/gupalovelefusilum.pdfIn PDF document text
    • https://jonaduxito.weebly.com/uploads/1/3/1/3/131384171/9171314.pdfIn PDF document text
    • https://varupeneg.weebly.com/uploads/1/3/0/9/130969993/6131585.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/7ebcd4cdd38e06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470020/normal_601b2eeb17e52.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/8nTghcd/15867072168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412377/normal_60155936eaff6.pdfIn PDF document text
    • https://cdn.sqhk.co/lomekojop/jhezYge/25097979650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_6022bab9231ec.pdfIn PDF document text
    • https://pixavegabub.weebly.com/uploads/1/3/5/3/135307945/gijiridire_jonesogoze_tukotuwugileka.pdfIn PDF document text
    • https://fotofewoxa.weebly.com/uploads/1/3/4/8/134849098/6622986.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/hesjbhj/moto_widget_settings.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/gYie2lx/zovukiwogegimexutel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469359/normal_5ff1e780980e5.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/jiAielE/truck_driver_eastern_freeway_accident.pdfIn PDF document text
    • https://cdn.sqhk.co/balatexoriv/diiwaMS/air_attack_2_mod_apk_1._4._2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_074236b300d948aa855c5ee04cf3492e.pdf?index=trueIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_577838dbec5c483dbb29c7c065199a3f.pdf?index=trueIn PDF document text
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_cc2f2668330e42a485460e025a3915e3.pdf?index=trueIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_ed8e350b794a453ca450aedd88166951.pdf?index=trueIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_c4b1b20464784d18b7bccb2d0de66106.pdf?index=trueIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_470f4d90b8c9410da5945389fea09d44.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_1ed4f3e6910848139eade3eba43367bf.pdf?index=trueIn PDF document text
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_347ddd4a53694fe295dc1e75aafe39bb.pdf?index=trueIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_5b1adcb3827742aaae32d0a37edbf92c.pdf?index=trueIn 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_off00012345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12345 5892 bytes
SHA-256: 669c05dc7dcc2e8cc9f92d31545d63baac40ba801a12843ebc43052b22e4a72b
font_01_sfnt_off00013744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13744 11056 bytes
SHA-256: d49c9d9c6eb850867268f46d02e6fdfa02f94a45b7fc92679ee7d94a933e7c62

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