Malicious PDF — malware analysis report

Static analysis result for SHA-256 159f2f767ac0ac72…

MALICIOUS

PDF

63.1 KB Created: 2021-02-06 12:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0018b305cd9864986c790014ec1d2312 SHA-1: ab9f2b1d965d3d469701f405950360cf446fed9b SHA-256: 159f2f767ac0ac72234d0c0e8a4e3aeb6344ca83882afcd9d82891e1fa506952
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to PDF files hosted on various domains and S3 buckets, suggesting a link farm or redirection mechanism. The primary URL, 'https://maypoin.ru/wb?keyword=cherry%20pepsi%20nutrition%20information', is likely part of a phishing or scam campaign, using a seemingly innocuous keyword to lure victims. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan distribution.

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://maypoin.ru/wb?keyword=cherry%20pepsi%20nutrition%20information PDF link annotation
    • https://kusipujetaz.weebly.com/uploads/1/3/4/4/134462876/d997a32.pdfIn PDF document text
    • https://xamatetafuxu.weebly.com/uploads/1/3/1/6/131606968/sowepemipujemusowo.pdfIn PDF document text
    • https://mejavepo.weebly.com/uploads/1/3/1/4/131438157/2048328.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415537/normal_5ffa87f17d23f.pdfIn PDF document text
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/kulirolaluw-davobikobogo-jewulepuxelenok-jefozi.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/laginekux/sawiteralufofebu.pdfIn PDF document text
    • http://wivoruremuwun.rf.gd/80918377534.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/81093866309.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/nunigijipebiniwuna.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/cell_cycle_interphase.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/xufeneponojitakaj.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/staples_large_tab_divider_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/healthy_shakes_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/beneficios_del_aprendizaje_cooperativo.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/setazegudazuzefenegif.pdfIn PDF document text
    • http://zepedijuva.epizy.com/aspekto_ng_pandiwa_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/report_dog_attacking_another_dog_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/guideline_for_stemi.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_off0000bbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCF 5116 bytes
SHA-256: 7767fc5528ea452fde89e486831461950c097f0af4b7705e8b0cdf4ace7c8706
font_01_sfnt_off0000cd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0C 10044 bytes
SHA-256: f37104d0a44df84385c561d630b03309414bfb2115c9e9e7ba08d1c24c2e4a53

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