Malicious PDF — malware analysis report

Static analysis result for SHA-256 5502d3de3ff2d97d…

MALICIOUS

PDF

72.5 KB Created: 2021-02-03 13:09:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fda312c00d536fc4ec6df894cce52e6f SHA-1: ba7990f22d0a7d44e8eaf74a31b4deee23b253b8 SHA-256: 5502d3de3ff2d97d4bb8c5eca3e49f61f3d5c6f8ec1d1e082dd08cf2564bf325
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, including hidden ones, designed to direct users to malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest exploitation of PDF vulnerabilities or social engineering to lead users to malicious content.

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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://jacksth.ru/123?utm_term=does+swimming+make+you+taller+after+16 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370540/normal_5fc6597b16ba0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401712/normal_5fef7d32bb1b5.pdfIn PDF document text
    • https://gedepaxu.weebly.com/uploads/1/3/1/3/131378821/rojiw.pdfIn PDF document text
    • https://mojabizozawobe.weebly.com/uploads/1/3/4/6/134699592/7a3d29e9c42704.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/lips_xbox_360_song_listxhvjw.pdfIn PDF document text
    • http://golosa-spasibo.ru/nupepuwumiy1v38.pdfIn PDF document text
    • https://lopuvekire.weebly.com/uploads/1/3/0/8/130813144/sepoteleb.pdfIn PDF document text
    • https://lutaxebibutemun.weebly.com/uploads/1/3/1/3/131380730/nulevurigizipi.pdfIn PDF document text
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/juvev_buvajo_xofije_siworopapajoxis.pdfIn PDF document text
    • https://nimimetifav.weebly.com/uploads/1/3/2/8/132814674/gixufarer-videbuzovuben-puzinugubara.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450038/normal_5ff362b219a4b.pdfIn PDF document text
    • http://fashion-deals.xyz/hdfc_bank_ltd_dd_formp42ke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494165/normal_5fdedc8a40846.pdfIn PDF document text
    • https://lekevemu.weebly.com/uploads/1/3/0/7/130776436/4583815.pdfIn PDF document text
    • https://varusotefus.weebly.com/uploads/1/3/1/3/131398431/jefen.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/xamibebulosaxug/15194915360.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/65605399318.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/dexuri.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/vcredist_x86_2013._exe_free.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/tamil_christian_choir_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/formation_ambulancier_croix_rouge_romainville.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_off0000df19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF19 5552 bytes
SHA-256: 1c81c30b48cd7b4b3153a4a2f077b3eac413bf4f6c775ebc36c0b0a00b6e51ee
font_01_sfnt_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 10068 bytes
SHA-256: 64fd4913a7126542d2bfd4d23767c02f13e5b09cba0f5b4dfbe6ff2c78b3fff2

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