Malicious PDF — malware analysis report

Static analysis result for SHA-256 855998a81e795c5d…

MALICIOUS

PDF

87.5 KB Created: 2021-02-16 12:46:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 515bebe037761d102457d782cd224c49 SHA-1: fd125eaef2952e30f1f2411797638e549c6aec41 SHA-256: 855998a81e795c5db02effdfdd05cf2b1c91eb8f3a350a8614bf02a7b190ded2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable hosting and link farm patterns, indicating a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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
  • 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://seumenha.ru/wix?keyword=objective+point+of+view+examples+in+literature PDF link annotation
    • https://puwegamojone.weebly.com/uploads/1/3/4/7/134702565/kagemod.pdfIn PDF document text
    • http://xalukofokunes.iblogger.org/angkara_power_metal.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/jcoibjj/85677267465.pdfIn PDF document text
    • http://natalonofawoba.22web.org/zukupunipugariwovinibeb.pdfIn PDF document text
    • https://dazafilitekanib.weebly.com/uploads/1/3/5/9/135977429/1799704.pdfIn PDF document text
    • https://cdn.sqhk.co/libarazituw/bheicGM/bugetasezegobetuzixuje.pdfIn PDF document text
    • http://bitipusefotas.66ghz.com/book_of_mormon_musical_script.pdfIn PDF document text
    • https://boziwukajolefix.weebly.com/uploads/1/3/2/7/132711983/sifisurazivo_vupelibezekadu.pdfIn PDF document text
    • http://gezilobogobig.22web.org/41113234090.pdfIn PDF document text
    • https://mejatuwunuzawe.weebly.com/uploads/1/3/0/7/130775850/ea533a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nutogexutal.rf.gd/togutixefigabamuwipari.pdfIn PDF document text
    • http://mudefikireneb.rf.gd/dapavavokiso.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/39036978312.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/colour_butterfly_hd_images.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/nutrition_information_butterfly_pork_chops.pdfIn PDF document text
    • http://nogojituwizax.epizy.com/xezuzer.pdfIn PDF document text
    • http://ragadatelu.epizy.com/73623495168.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 5624 bytes
SHA-256: 4a8cfff24825cb163a88a2d7353b1a59b8578b20162dec7778bf3a5dacf8632f
font_01_sfnt_off00010fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB4 1800 bytes
SHA-256: a107e322bcd633a2304c0b450800fe683a09a45e455a4dbf1d4e7cb59ef2fa8b
font_02_sfnt_off00011892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11892 10172 bytes
SHA-256: b93e36f98fdedf342bf34f0d00720ad44c935a448208a52d99cd3c1de7101269
font_03_sfnt_off00013b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8D 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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