Malicious PDF — malware analysis report

Static analysis result for SHA-256 f024d7331c49349e…

MALICIOUS

PDF

73.3 KB Created: 2021-01-21 19:39:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d2b5fa4e8d98852ab067dcaf30e0519d SHA-1: 7e60c649170ae45e70a223c800855fe50c005a65 SHA-256: f024d7331c49349e3e0631b75916d34e7382140d2d32c4b7b1310ab3e5f6c843
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=asa+fastpitch+softball+pitching+rules+2019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372681/normal_6007c036f0a57.pdfIn PDF document text
    • https://tixuxawopor.weebly.com/uploads/1/3/0/7/130738504/5528886.pdfIn PDF document text
    • https://sigibemora.weebly.com/uploads/1/3/3/9/133986782/20e2a32e8319.pdfIn PDF document text
    • https://nagugopusoz.weebly.com/uploads/1/3/4/6/134645600/vadubinuwomag_likutal.pdfIn PDF document text
    • https://fodukajanewirom.weebly.com/uploads/1/3/5/3/135383911/lusipom.pdfIn PDF document text
    • https://nutiniwe.weebly.com/uploads/1/3/4/8/134870290/1250814.pdfIn PDF document text
    • https://gipulafu.weebly.com/uploads/1/3/4/4/134442702/figubebibol.pdfIn PDF document text
    • https://ziloxewimufe.weebly.com/uploads/1/3/0/8/130813797/mufurefij.pdfIn PDF document text
    • https://tawuvumiru.weebly.com/uploads/1/3/5/3/135326103/palelovoguzarifadeb.pdfIn PDF document text
    • https://javekekowunafot.weebly.com/uploads/1/3/5/3/135324960/79acd3cdcca6.pdfIn PDF document text
    • https://zisafidavilux.weebly.com/uploads/1/3/2/8/132814196/9cec202dc.pdfIn PDF document text
    • https://monemoret.weebly.com/uploads/1/3/4/6/134667898/5ecff7.pdfIn PDF document text
    • https://fobaripiso.weebly.com/uploads/1/3/4/4/134443650/41210d7ee75.pdfIn PDF document text
    • https://sixixufur.weebly.com/uploads/1/3/2/3/132303163/jibenula-kupizetakame-suseralevejogib.pdfIn PDF document text
    • https://jazelisis.weebly.com/uploads/1/3/4/8/134870131/4752f826eb7a.pdfIn PDF document text
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/fibewapikofelef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xubedoper.epizy.com/ruligifetibuwakalejupeji.pdfIn PDF document text
    • http://wefexafunedex.epizy.com/vuruwimijuwo.pdfIn PDF document text
    • http://metivatozu.epizy.com/xojomubimog.pdfIn PDF document text
    • http://rikovaniroxatox.rf.gd/corbettmaths_estimation_answers.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_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 5888 bytes
SHA-256: 4f0dfac3099b3ef99dff6f7a761d7c0e190e1441fc577b7780906e3df581fee3
font_01_sfnt_off0000f666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF666 9732 bytes
SHA-256: 0f2c5f27c9e23152324cf3861b2c2b6192d894d950fd0a26228b1ff903c22c70

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