Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbbd8a77bfd1f9b…

MALICIOUS

PDF

93.4 KB Created: 2021-02-15 20:26:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e4a55622fb644340116473ca49d3fafa SHA-1: cb743f065ff249ed3392b6d9e350e609926f53fd SHA-256: 8fbbd8a77bfd1f9be445e6f3eb059b88f8c5f5022c5af0cd34d0557c5b300dda
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, indicating a link farm or SEO abuse. One prominent URL, 'https://leonvi.ru/strik?utm_term=ironman+inversion+table+with+heat', is directly embedded and likely leads to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://leonvi.ru/strik?utm_term=ironman+inversion+table+with+heat PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469836/normal_5fe31e4061be9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495039/normal_5fd2e6f2ad296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425229/normal_6010d7be1a9a2.pdfIn PDF document text
    • http://odemebayisitrafik.com/egg_wars_2_download09v23.pdfIn PDF document text
    • https://vemegerefawobe.weebly.com/uploads/1/3/2/6/132682093/bexewigutenofaxewaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_601ae32b004df.pdfIn PDF document text
    • http://tk-time.site/lahore_weather_report_todayuh7zy.pdfIn PDF document text
    • http://shop-onlain.fun/report_compilationrmdue.pdfIn PDF document text
    • http://magnetfix.store/yakuza_4_hostess_guide7jeks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417525/normal_6027c075a75b2.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/wovisak/72127301884.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/18482122972.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/fezamegifewarabax.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/mesuvejisowevixolexapew.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A5 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 3080 bytes
SHA-256: 3ea9dc0fe5daeba8b7c1286de8752a991578e51b79301a8010be3d8f06b4997c
font_02_sfnt_off00010263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10263 4940 bytes
SHA-256: c92e6e9394bd873ddaec4672cb06f901a0ded66c2e3d4d5b7c510b639449a175
font_03_sfnt_off000112f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F4 2092 bytes
SHA-256: 6e5de5c6bcb7fdd8c5ca0d25823a8f80e6c764803c1b732dbc9c425a5c0f8ea5
font_04_sfnt_off00011c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 11116 bytes
SHA-256: 75a89e7c9d4f5d5e28c148ff7068181d81d0cb182f48a824dbd869597ea789a9
font_05_sfnt_off000142d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D0 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660
font_06_sfnt_off0001585b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1585B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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