Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d630accd4e38bb…

MALICIOUS

PDF

89.3 KB Created: 2021-03-17 23:24:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f2760464887a6f4ac3139fcfcd927b51 SHA-1: 5914f5e7ff5205b866d0ac71cafb2deaf13815a9 SHA-256: b4d630accd4e38bb630009e7777417e14a8d632a7c217dd9edf14c43ba8aada1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://mezovuduw.ru/award?keyword=arithmetic+and+geometric+mean+pdf PDF link annotation
    • http://lezigovedavide.getenjoyment.net/93378321214.pdfIn PDF document text
    • http://diporesorojina.scienceontheweb.net/fonukijarinevirowediz.pdfIn PDF document text
    • https://kewojuposadut.weebly.com/uploads/1/3/4/3/134374438/xasifimakev-mujuberibamito.pdfIn PDF document text
    • http://bionatur.space/numberformatter_decimal_placesmk8tw.pdfIn PDF document text
    • http://luxisulejoxo.getenjoyment.net/10989124917.pdfIn PDF document text
    • https://tikuvafijosil.weebly.com/uploads/1/3/4/6/134685963/7306316.pdfIn PDF document text
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/vupomifalezo.pdfIn PDF document text
    • http://mukinokelek.mygamesonline.org/cantor_s_intersection_theorem.pdfIn PDF document text
    • http://sfhgfje5df.xyz/what_are_sex_and_the_city_stars_doing_nowgsztl.pdfIn PDF document text
    • http://kovatafob.mypressonline.com/67456070162.pdfIn PDF document text
    • http://espaceabonnes.com/allu_arjun_songstdrlj.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/16815536717.pdfIn PDF document text
    • http://uabiomanix.xyz/suzowemiswmwxn.pdfIn PDF document text
    • http://raxewaponoxiv.mygamesonline.org/30751453209.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/korabitejodo.pdfIn PDF document text
    • http://ruwosiju.getenjoyment.net/ligonuluw.pdfIn PDF document text
    • http://chategratis.online/logedolakugukagavafap6utw0.pdfIn PDF document text
    • https://bupedokan.weebly.com/uploads/1/3/1/6/131607930/fumodotetosowejon.pdfIn PDF document text
    • https://ragojozuzaz.weebly.com/uploads/1/3/4/6/134668900/futuduvija-jojirusuzuje-xomosojuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bitujiduruv.myartsonline.com/metro_2033_book_audio_english.pdfIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_f36cacbd48cd4a22bf375e223651f4ef.pdf?index=trueIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_7578cfec300241cca5f452702ee1d6d8.pdf?index=trueIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_e2a0319d8f934934832cb07cba1e38aa.pdf?index=trueIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_4589c643ec9c48babd4360b252c6c6d5.pdf?index=trueIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_953425af9d5c478f88fc4ea6359ab74e.pdf?index=trueIn 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_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 5348 bytes
SHA-256: 87c0d578d0d6dcc948e0e606b8bd3d7b732d9003252d97962faa68062bc8217c
font_01_sfnt_off00011682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11682 13132 bytes
SHA-256: 82eb5d44cbf7c5694fcd6f04f18a3c8dac57ad62f3948fd110a1b9283273b4d4
font_02_sfnt_off0001424f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424F 16172 bytes
SHA-256: 3393f19fbfd8ffe67401660fce9eb8c7a88614fca549185d60de61b5123b0853