Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ba459a24273375…

MALICIOUS

PDF

79.6 KB Created: 2021-03-30 22:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 115ef80d339d2d020a130194abff7cec SHA-1: cfa109ed550ea965595632331ad5b95fb66bb2ee SHA-256: b9ba459a242733752a73ba080d9e2f0dd1f65f967a882e14b0bffe30c538137e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings reveal it contains numerous embedded external URIs, with a specific focus on link farming and disposable hosting, suggesting a phishing or malware distribution scheme. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly support its classification as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=horizon+high+school+football PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471235/normal_5ffe4cf5d61ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408588/normal_5ffb199fb0a8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490138/normal_6046201a88dcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_5fe8e76336a16.pdfIn PDF document text
    • http://lumejaramelu.mygamesonline.org/cdr_to_converter_online_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_605321bd6f17e.pdfIn PDF document text
    • http://kavelizopepi.mywebcommunity.org/how_to_set_time_on_timex_alarm_clock.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481282/normal_60329ab37a419.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://ludugatitabi.atwebpages.com/cirrose_medicamentosa.pdfIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_1a1fbbc7bbff42f0b511c66a3814d2b2.pdf?index=trueIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_bf33f7fd507a460e816b9168d50e933e.pdf?index=trueIn PDF document text
    • http://kijonag.onlinewebshop.net/cctv_camera_brochure.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/denunogapokinezujunop.pdfIn PDF document text
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_50fc2461930b46fdb971b7b856564495.pdf?index=trueIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_7d437c52a5924a21bc12391b1cf5c1ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/2069326792.pdfIn PDF document text
    • https://9dc8676a-0e58-44ee-a512-e339c7094702.filesusr.com/ugd/7c0652_cbf2f8e3a4554acaabad7684f9d471e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paropabaru/captain_america_in_isaidub.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_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 4964 bytes
SHA-256: 4003b28c3ccf0bccc9c2c80b49ff3695609511a625201bb038b5eee83d50ce8f
font_01_sfnt_off0000fdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBA 11076 bytes
SHA-256: 471ce5af70ee26c55888b9da918dfaed06682c5e53bdb6525804806686a99f9c
font_02_sfnt_off0001233b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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