Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a61bef6628675a6…

MALICIOUS

PDF

82.0 KB Created: 2021-03-12 18:40:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 2e87ad7195609e0e205d2c594b160d2e SHA-1: 9e70f8039c8ad2804a8be84535bdf80db6f8d8bb SHA-256: 7a61bef6628675a6aa2ece4a69079ec43a87bc1ec556835feb46a3ab55e29557
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains and are designed as a link farm. One prominent link redirects to 'https://yafferge.ru/wix?keyword=wifi+cracker+apk+github', indicating a phishing or malicious content lure. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=wifi+cracker+apk+github In PDF document text
    • http://sunakijabe.sportsontheweb.net/texogakisininum.pdfIn PDF document text
    • https://medadafamu.weebly.com/uploads/1/3/0/7/130775854/juzuw.pdfIn PDF document text
    • https://miduginoxem.weebly.com/uploads/1/3/4/8/134892771/ralawowesijanugire.pdfIn PDF document text
    • http://sifimomikev.sportsontheweb.net/widerukalepoj.pdfIn PDF document text
    • http://sosiwuro.iblogger.org/cursor_in_oracle_forms.pdfIn PDF document text
    • http://xanimupa.22web.org/qual_o_significado_do_domingo_de_ramos_para_a_igreja_catlica.pdfIn PDF document text
    • https://rogupogadagome.weebly.com/uploads/1/3/1/3/131398605/d168d5e4b9dbcb.pdfIn PDF document text
    • http://filuxunokenobud.mygamesonline.org/8302865947.pdfIn PDF document text
    • https://xasigali.weebly.com/uploads/1/3/4/3/134363336/8989685.pdfIn PDF document text
    • https://jumomemokipus.weebly.com/uploads/1/3/0/8/130874307/ragiwojenew.pdfIn PDF document text
    • https://pagununida.weebly.com/uploads/1/3/4/8/134861868/vunexitamorigi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lijowavatajo.myartsonline.com/83765007884.pdfIn PDF document text
    • http://jowawotivedalox.rf.gd/bangla_movie_sathi_hara_nagin.pdfIn PDF document text
    • http://joriboka.epizy.com/silomixuxe.pdfIn PDF document text
    • http://laxowukuwex.epizy.com/64653913540.pdfIn PDF document text
    • http://jekojefakowosep.rf.gd/78143961466.pdfIn PDF document text
    • http://mumelekuxo.epizy.com/tujusupedakofivenup.pdfIn PDF document text
    • http://lofoxos.epizy.com/do_ceramic_heaters_work_well.pdfIn PDF document text
    • http://bukarujinadir.epizy.com/tepanifuvul.pdfIn PDF document text
    • http://rafoputoxuxu.epizy.com/feleminamepelepozuse.pdfIn PDF document text
    • http://vetoraj.rf.gd/jaxufiputetejenuzizubexew.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 5284 bytes
SHA-256: 11421130b1508b5a73471cd8b339ee25099121ac75772dc5ed66048db3a8684f
font_01_sfnt_off000100c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 10400 bytes
SHA-256: 746fe718c457835d8764e52f1833842b9e5bb7ac525b5ddcce7b2606ccb008d2
font_02_sfnt_off00012496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12496 16352 bytes
SHA-256: d5c1d73facc1ee30369663d5bc9e1d56b1b6bad2d1eb0652642bc5daa7bdf87b

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