Malicious PDF — malware analysis report

Static analysis result for SHA-256 437b67825e6236cb…

MALICIOUS

PDF

66.3 KB Created: 2021-03-31 11:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 882441ea92261f89d679f3ebf588591f SHA-1: 11d1851f8227abfe7d7208c01188353d3fc18cc2 SHA-256: 437b67825e6236cbaf166fe7f5dad541341c937ba764fb65eac330ea2993a2f0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9992

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 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.
  • 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://jottigo.ru/award?keyword=sketch+the+pdf+and+cdf+of+a+random+variable PDF link annotation
    • https://baxorejo.weebly.com/uploads/1/3/5/2/135295822/juzede.pdfIn PDF document text
    • https://sofodifimujinem.weebly.com/uploads/1/3/4/2/134234674/8568785.pdfIn PDF document text
    • https://pimazapodozem.weebly.com/uploads/1/3/2/8/132814260/xojiko.pdfIn PDF document text
    • https://tenewalewufubin.weebly.com/uploads/1/3/5/3/135329800/tegexegaxajet-vomoruw.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/ielts_essay_writing_topics_with_answers.pdfIn PDF document text
    • https://mapijilut.weebly.com/uploads/1/3/0/8/130873952/luzadudas.pdfIn PDF document text
    • http://gatofupimekow.mywebcommunity.org/mogofave.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/brand_new_day_the_wiz_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/93880587320.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/how_to_plug_in_pmd_clean_pro.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/beats_by_dre_powerbeats_pro_true_-_wireless_earbuds_-_moss.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/zubovakojalino.pdfIn PDF document text
    • http://bokepomi.onlinewebshop.net/72627777389.pdfIn PDF document text
    • http://zevesijuduma.atwebpages.com/61318496005.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/mukosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3591bf89-4332-44aa-968d-5c645298dea0/qual_dia__feriado_no_carnaval.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/82819325563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72f78829-e187-4980-a91d-f0ff4a9d0760/sikew.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/invitation_for_debut_template.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/93348825232.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/dominican_breviary.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/70187699014.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/pizoxefoguw.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/ms_office_2016_full_version.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_off0000c6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CC 5584 bytes
SHA-256: f82171199318cb4d5e7fb8cedbd2478848076866905092fdd510d900c12e7011
font_01_sfnt_off0000d9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AD 9948 bytes
SHA-256: ca4841ca8c6225af6f7f0acccdcf722e421d0690f84d33b8efb4fe205eca8a8b

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