Malicious PDF — malware analysis report

Static analysis result for SHA-256 b423a90a5bddf80e…

MALICIOUS

PDF

79.5 KB Created: 2021-03-31 16:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a1a98000378c0729594297e02d7fa120 SHA-1: da6c33befb4e6ccf24b992026b3fe39ddc918c22 SHA-256: b423a90a5bddf80e7f3a2a5316b9e9d49a2e1d548341ec15bad869258849dcb3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9990

Heuristics 5

  • 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.
  • 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://botokaw.ru/123?utm_term=wanted+dead+or+alive+piano+sheet+music PDF link annotation
    • http://voirlo.xyz/jobananexg944d.pdfIn PDF document text
    • http://marketes.pro/fififvgexc.pdfIn PDF document text
    • https://sivikowililip.weebly.com/uploads/1/3/4/5/134599649/1825702.pdfIn PDF document text
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/lunibudikaravurifima.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425924/normal_5ff90bfb27140.pdfIn PDF document text
    • http://limuzinof.ru/18676515816pdjfg.pdfIn PDF document text
    • https://tavasosezirom.weebly.com/uploads/1/3/4/7/134768566/fcde1e.pdfIn PDF document text
    • http://panokaluwavivar.iblogger.org/vitezixizilel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381294/normal_6063ed4d77eef.pdfIn PDF document text
    • http://auto-fishing-rods1.club/89536160202loni7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422638/normal_5ff2fe97bf651.pdfIn PDF document text
    • https://vugadeji.weebly.com/uploads/1/3/1/4/131406436/jipujuw-wekotadapojed-tunuzowif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372987/normal_602b7d5605e4c.pdfIn PDF document text
    • https://mitamegupep.weebly.com/uploads/1/3/2/3/132302953/2165243.pdfIn PDF document text
    • http://navaram.online/lotimajixunevejesoxupapoj1gm9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kovozenamofox/taduwaposefel.pdfIn PDF document text
    • http://xivajaraseb.rf.gd/92807929701.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/rutonivovefudogofo.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/executioner_meaning_in_kannada.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/american_born_chinese_character_map.pdfIn PDF document text
    • http://kipabiz.rf.gd/absolute_value_calculus.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/platform_picture_ajay_devgan_ka_hd_mein.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/android_17_mir.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/38397381979.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 5268 bytes
SHA-256: c25880c7ca0107cb0641f262ac0d9292d48ae47a8922f2ba7a50b71b325fffc7
font_01_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 10552 bytes
SHA-256: 113642721f1a416e146363df636d4bd533a2d4b64e091a52e93594b4384b2f7c
font_02_sfnt_off00012248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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