Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44a7aadcfade95c…

MALICIOUS

PDF

77.9 KB Created: 2021-05-02 11:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d04dc0e721935ef3cc80977d53e36297 SHA-1: 6ec714accfcfb3e9104e44428761f5af3eea1252 SHA-256: a44a7aadcfade95ca8e3b13a2a6092e99c02b851507e0ba2c74e04cf80da6aaf
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, pointing towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=nespresso+vertuoline+maintenance PDF link annotation
    • https://gulipuzajetag.weebly.com/uploads/1/3/5/3/135397689/gabopato.pdfIn PDF document text
    • http://bandalet.club/63450810463wp1m0.pdfIn PDF document text
    • https://lagonola.weebly.com/uploads/1/3/4/8/134851586/mifena-rozotokup.pdfIn PDF document text
    • https://mekebibarefuj.weebly.com/uploads/1/3/5/3/135335096/nukakejumuvefebov.pdfIn PDF document text
    • http://bestita.space/vujonanovuzijowuw6bac.pdfIn PDF document text
    • https://kodepifaz.weebly.com/uploads/1/3/4/7/134705681/3e539de6.pdfIn PDF document text
    • https://tevomijirurefo.weebly.com/uploads/1/3/4/8/134846864/zevuwovol.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/wonisadegesavunenun.pdfIn PDF document text
    • https://xizenebijebis.weebly.com/uploads/1/3/2/3/132303300/wibul.pdfIn PDF document text
    • https://vimosetadasosus.weebly.com/uploads/1/3/2/7/132740377/xufonimapunurev_nugotuf_lonapa.pdfIn PDF document text
    • http://googsnat.space/rufujuri7ympf.pdfIn PDF document text
    • http://diporesorojina.scienceontheweb.net/manual_roller_bending_machine_project.pdfIn PDF document text
    • http://mbfsopg.com/stihl_ms_170_bar_oil_adjustment70tth.pdfIn PDF document text
    • http://lufexaxoxak.mygamesonline.org/software_to_convert_into_editable_word_document.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451752/normal_5fdae88678fb3.pdfIn PDF document text
    • https://wezoduvum.weebly.com/uploads/1/3/4/0/134096245/5639110.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495999/normal_5fc7d2d6355c4.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/pirofopafu/fitosivoper.pdfIn PDF document text
    • http://sopavame.onlinewebshop.net/89361026286.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/lords_mobile_guide_heroes.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_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 5108 bytes
SHA-256: 9de9ff4eba90715bfd852e5253a3b8c46c41ccade72f8f19b77bf7c04151adcd
font_01_sfnt_off0001064e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 10652 bytes
SHA-256: 6a78bccc284ddb24e98662e2a425a6a9100f526dd12d7a5739ba97fedb9c880e

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