Malicious PDF — malware analysis report

Static analysis result for SHA-256 688843a84126f6db…

MALICIOUS

PDF

69.9 KB Created: 2021-09-12 10:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b61c978195b38598dc39b48b8b41358e SHA-1: 0259654478a9e0e8878d5e20eee79132a1750cbe SHA-256: 688843a84126f6dbf741d87aeb4eb4c5e8a215536b6bd37b7c121311c8355b02
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 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://allytemp.ru/uplcv?utm_term=igo+primo+truck+android+apk PDF link annotation
    • http://tamtamphat.com/upload/files/dipegorunizejig.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/99771327084.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/45329577248.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/moduxokuv.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/51719991088.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/gajufuvekum.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/92700986655.pdfIn PDF document text
    • http://mcutech.net/files/66754708283.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161364e0546a17---30038085370.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/xeleduraxukojofa.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/mipuvelobijakukoz.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/21711532954.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/13499411753.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/27257731887.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-11/210911220628270617fr9vjs1jxru2.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210907_022722.pdfIn PDF document text
    • http://gabortech.com/admin/file/64311577051.pdfIn PDF document text
    • https://phr4u.com/files/31873280734.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/moxiwotukajepibe.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/pajiruriwarudowaxuxopafan.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/nanajiravetezomisewaga.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/95912852223.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/32846789317.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31B 10656 bytes
SHA-256: 750200edf64dc444871a5d79e98d0df45ce896717290640c9dfe42bd0f6663a3
font_01_sfnt_off0000cb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4B 15224 bytes
SHA-256: 4f0d179ad5487118a882d97b6fcb3b004de0aba3610a2b31be269aa418dbb20d
font_02_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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