Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c81f9d4e52e6b6…

MALICIOUS

PDF

103.4 KB Created: 2021-05-02 11:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4c7ab2bdc2f773d0d99e47b58c53704b SHA-1: d840bec73a04b153993b6a27d518dff4bc7286f9 SHA-256: a8c81f9d4e52e6b6c461adafa71e823fbbfe51387426e3f3ddfdbf86fd013bbb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or redirection attack, likely intended to lead the user to a malicious site.

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://bologen.ru/strik?utm_term=matlab+plot+axis+font+size PDF link annotation
    • http://wimawukit.iblogger.org/blood_test_results_explained.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476147/normal_60068e86069f4.pdfIn PDF document text
    • https://cdn.sqhk.co/jozazixefuf/edMrbih/gowuxazanukixe.pdfIn PDF document text
    • http://bisewilorilamej.sportsontheweb.net/jafolakavas.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/dIjhjjj/25218802305.pdfIn PDF document text
    • http://fubegumusevupe.iblogger.org/cardiovascular_disease_treatment_and_prevention.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465402/normal_5ffb663a836aa.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/shcjadJ/hat-_trick_in_t20i_history.pdfIn PDF document text
    • http://gabigubegavuso.22web.org/normality_test_skewness_and_kurtosis.pdfIn PDF document text
    • http://xoxosedefoxadu.mygamesonline.org/gamudov.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/Hhe2tih/joterakodaxusabowot.pdfIn PDF document text
    • http://tevituvodejifep.mywebcommunity.org/8564798525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489440/normal_6048f4a0df4b4.pdfIn PDF document text
    • http://dolinunuridaku.iblogger.org/watenofixirepiral.pdfIn PDF document text
    • https://cdn.sqhk.co/wotutovebo/aDXhdij/komolekiporusozugax.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/kadivobegovotojupad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiwufuwivuvuf.epizy.com/easy_happy_birthday_piano_sheet_music.pdfIn PDF document text
    • http://kiwusumusi.rf.gd/rorulefomatoxerilezenis.pdfIn PDF document text
    • http://ramupamotolaj.epizy.com/composition_of_functions_worksheet_2_answers.pdfIn PDF document text
    • http://kesufelitam.rf.gd/90242904747.pdfIn PDF document text
    • http://voxotili.epizy.com/consumer_awareness_meaning.pdfIn PDF document text
    • http://fuzolegogi.atwebpages.com/90625387596.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_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 35628 bytes
SHA-256: eec53aa37b6bfceec6c2f9cfce3e89999cae834d4b2a657acb3cc538f3cb37e8
font_01_sfnt_off0001563b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1563B 5064 bytes
SHA-256: 466c4228d6138f611076074a06c3f2c8717c0305954b9fecab5d75d178309f97
font_02_sfnt_off000167a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167A2 11176 bytes
SHA-256: 946e845d2123dec2cb432a52e0fe9524a6bc682ff11b6b39c5cc7c677b63ccf2

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