Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03b961f3027814f…

MALICIOUS

PDF

79.3 KB Created: 2021-02-18 03:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 705a775de00771ff918b7656945422f5 SHA-1: 32fcea39df22675e1d5cd7f54826b011ad01447d SHA-256: c03b961f3027814f33743846b62c7125c782664ba200518dc1a7219e3b1a5dde
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristic firings suggest it functions as a link farm, directing users to various URLs under the guise of providing a physics textbook download. The presence of embedded URLs and the link farm nature strongly suggest an attempt to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=physics+12+textbook+pdf+download PDF link annotation
    • https://cdn.sqhk.co/gukokefa/ijbNLx2/otobus_simulator_ultimate_pc_ye_nas_l_indirilir.pdfIn PDF document text
    • http://yblda.fun/bodybuilding_diet_plan_android_app4pjjq.pdfIn PDF document text
    • http://bevibopo.22web.org/irs_grantor_trust_reporting_requirements.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxoporerom/8ZV9yij/cake_decorating_store_houston.pdfIn PDF document text
    • https://cdn.sqhk.co/najafizox/hatRgja/baby_dinosaur_jumper_knitting_pattern.pdfIn PDF document text
    • http://triple-doska5.club/austria-_hungary_military_uniforms12tv4.pdfIn PDF document text
    • http://maxovulosaxa.22web.org/john_deere_d110_riding_mower_tire_pressure.pdfIn PDF document text
    • http://voduvalegef.66ghz.com/25925152131.pdfIn PDF document text
    • http://citrus-fruit.space/46212370108prkjr.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuzedu/jbjidie/95690746375.pdfIn PDF document text
    • https://cdn.sqhk.co/nujamuxeg/gshcrvI/25910474243.pdfIn PDF document text
    • http://runolive.com/sijoje90d1u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/japobowavobegusererox.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/mopekepavoledifudujapojub.pdfIn PDF document text
    • http://kizofenumuvuma.epizy.com/alchymista_zdarma.pdfIn PDF document text
    • http://lowevuribif.epizy.com/cheat_pubg_mobile_android_root.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/69047719958.pdfIn PDF document text
    • http://pamakejexo.epizy.com/18617191526.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/2256387395.pdfIn PDF document text
    • http://buxusemi.epizy.com/robert_half_report_time_worked.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_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 5796 bytes
SHA-256: 6719855c821bc36bee5c78b31fbb44488acd5616d083017a4037db03e2cd2ab0
font_01_sfnt_off00010b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B92 10512 bytes
SHA-256: 3399a2d16fc9a263ae712631131368f3fb2ca58565c9ab814444404297a13973

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