Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8ba46b46ffc192…

MALICIOUS

PDF

78.2 KB Created: 2021-04-06 05:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8aaaebd0653d055a86e10388c00a3e5b SHA-1: 47971f4a5cb1acd38d25a14b1f09e6ba46aa6237 SHA-256: 9c8ba46b46ffc192df815bab68cf510454dfd6c86698d001ddf801f4bb1976ae
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic identified it as a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'interview questions on java pdf', which is likely a pretext to encourage clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/award?keyword=basic+interview+questions+on+java+pdf PDF link annotation
    • http://gezudozu.iblogger.org/10387356439.pdfIn PDF document text
    • https://jasefeneg.weebly.com/uploads/1/3/4/4/134489721/nopupafobusege.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/18389719545.pdfIn PDF document text
    • http://wimudevereru.sportsontheweb.net/lista_de_adjetivos_posesivos_en_ingles.pdfIn PDF document text
    • http://nalodorepuwag.getenjoyment.net/kagatiluxunerozi.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/ienheig/kits_dls_psg_2020_para_dream_league_soccer.pdfIn PDF document text
    • http://fapseo.ru/troy-bilt_storm_2410_snow_blower_oil_changezwb8o.pdfIn PDF document text
    • https://cdn.sqhk.co/salasereki/fYfuGnV/54044705584.pdfIn PDF document text
    • http://axecheat7.xyz/45153897707rxpa3.pdfIn PDF document text
    • http://baby-slings.ru/singapore_kangaroo_math_past_papersm1avd.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/applications_of_computer_file.pdfIn PDF document text
    • http://rebelliona.online/how_to_replace_a_fuse_on_heater3lyus.pdfIn PDF document text
    • https://bipokedofep.weebly.com/uploads/1/3/5/3/135322207/9514097.pdfIn PDF document text
    • http://rufoferapavinew.medianewsonline.com/ncaa_division_2_basketball_championship_2019.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/30511515645.pdfIn PDF document text
    • https://cdn.sqhk.co/sefibenip/RZAjbhc/xamarin_android_navigation_drawer_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://toxifiv.myartsonline.com/mastoiditis_adultos.pdfIn PDF document text
    • http://nizofikunatafu.atwebpages.com/toxozozutup.pdfIn PDF document text
    • http://kawerulim.onlinewebshop.net/89684808616.pdfIn PDF document text
    • http://jokugagarin.rf.gd/lexus_es300_headlight_not_working.pdfIn PDF document text
    • http://nowimirozox.atwebpages.com/sanitary_napkin_vending_machine.pdfIn PDF document text
    • http://biledimetiwen.epizy.com/aiims_delhi_nursing_exam_answer_key.pdfIn PDF document text
    • http://dojezemuxeg.epizy.com/bufevitogososedovo.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_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 5520 bytes
SHA-256: c99d24b6a9d1fba6a72d5a896754397962c96885712af0ae5018219d80dcfbd8
font_01_sfnt_off00010670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 10916 bytes
SHA-256: 68dca1d941e932a9001226332b8ff90d8d000854f1aa6bf8328ceaa9bcc70b65

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