Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0839699510750b…

MALICIOUS

PDF

75.6 KB Created: 2021-03-19 11:21:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5e5a180eeb5293b3d24d98b53795b3fe SHA-1: 0300fcf9d1e3db11fa7d9c616ab21d23a355a3e2 SHA-256: 3c0839699510750bd7a2475bdaf817d80f7da1f3bc62c2df10b56fbdf56f1d20
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, as malicious. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, indicates an attempt to disguise the malicious nature by presenting a seemingly innocuous document conversion lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/award?keyword=conversion+of+pdf+file+to+word+document+free+download PDF link annotation
    • https://bolojowugupi.weebly.com/uploads/1/3/4/8/134886087/1992170.pdfIn PDF document text
    • https://wamurereleveti.weebly.com/uploads/1/3/5/3/135392703/5311614.pdfIn PDF document text
    • https://setibadumizokeg.weebly.com/uploads/1/3/4/8/134880372/dadux-xowolinovubo-xuzup-guxegufuvi.pdfIn PDF document text
    • http://sks-expertiza.ru/viseguzufidosodibzqnp.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/215b41b858db2.pdfIn PDF document text
    • http://tells.fun/after_book_google_drive_englishqh9fw.pdfIn PDF document text
    • https://rixodinek.weebly.com/uploads/1/3/5/3/135392020/11ace5da107a.pdfIn PDF document text
    • http://xatubaxo.iblogger.org/casio_g_shock_3263_manual.pdfIn PDF document text
    • https://tojuxumisadef.weebly.com/uploads/1/3/4/7/134714483/jiborikunamuvafepibo.pdfIn PDF document text
    • https://dirogine.weebly.com/uploads/1/3/0/7/130775503/zuwisizixasotuje.pdfIn PDF document text
    • http://bukawavado.medianewsonline.com/periappendicular_infiltrat.pdfIn PDF document text
    • http://viteroludobano.mypressonline.com/los_pensadores_daniel_boorstin.pdfIn PDF document text
    • http://jafinipu.scienceontheweb.net/faxopeze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_760717be39dd4b0f984ec13b013ba5ee.pdf?index=trueIn PDF document text
    • http://tawuzosidekelos.epizy.com/pidaput.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_f15e6f840830495e9453133d400f2c6c.pdf?index=trueIn PDF document text
    • https://9b321a86-0615-40a7-b684-6dced782f4cc.filesusr.com/ugd/e3cae3_f31906e4b9de4456a16062575714a656.pdf?index=trueIn PDF document text
    • http://difadedox.rf.gd/personality_vocabulary_list.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_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 5360 bytes
SHA-256: 5020229fe496342eaeb6e47238c52c4c926377a39d65fe396f45e4821a36cbf2
font_01_sfnt_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 10624 bytes
SHA-256: c3a6aad337fdad3ec6155c49506a47fa8b8a8e50dedfe741eee3cc2945131daf

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