Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d88f139a0470cd4…

MALICIOUS

PDF

95.0 KB Created: 2021-03-15 22:31:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e107cfadba7937671943a84728f52ca0 SHA-1: 581b571e06bc855a522f6acc30c308841b83b004 SHA-256: 8d88f139a0470cd4645bed5dc59e39e3c62d80083ac3140565810f06ac079bad
156 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 0.9998

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://pelibifir.ru/strik?utm_term=blood+bowl+rulebook+2020 PDF link annotation
    • https://giwitororozesal.weebly.com/uploads/1/3/4/6/134652081/6aa08ce5.pdfIn PDF document text
    • https://kowasazupajobex.weebly.com/uploads/1/3/1/3/131383373/739578.pdfIn PDF document text
    • https://lumikefobebodas.weebly.com/uploads/1/3/4/3/134324067/xivadimelef.pdfIn PDF document text
    • https://rajagoka.weebly.com/uploads/1/3/1/4/131406288/rekolapinulu_ximorola_kebasab_wudaputadasiz.pdfIn PDF document text
    • https://vorufiduwesonuf.weebly.com/uploads/1/3/5/3/135314955/sorode_kidez.pdfIn PDF document text
    • https://lowaribopuvege.weebly.com/uploads/1/3/2/8/132814272/gilogunepufomegofuze.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/how_to_use_my_alexa_echo_show.pdfIn PDF document text
    • https://bunojero.weebly.com/uploads/1/3/0/8/130874162/jivipuxekokipobu.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/fejopixovewudarin.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/jedobufudajewu/41273859242.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/27066839477.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/how_to_reset_g_shock_watch_wr20bar.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/kumumunaw.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/milamagadibijedobamip.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/witumusulape.pdfIn PDF document text
    • http://sopexalibip.onlinewebshop.net/les_cours_d_anglais_bac.pdfIn PDF document text
    • http://foxukekamusun.onlinewebshop.net/6239627204.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/sublet_agreement_template_bc.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/69144315467.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/free_sale_of_business_agreement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/hart_of_dixie_season_episode_guide.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BB 5052 bytes
SHA-256: dac79d924f7ada8653719c42f7aab77274447fc9e52482c024283fa6c6f5cbdb
font_01_sfnt_off0001470f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470F 11696 bytes
SHA-256: c12ba242644b7821c0e716e4ec04c9363c50698004d4b527f86c3e8f05853f7f

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