Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b9884d88a1b76d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-29 10:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6eaf22dabfc5f68820d9ebb35f8ce2b7 SHA-1: bedb52b4d450f5e0de4084c320da2aa526378411 SHA-256: c8b9884d88a1b76de55d3e0cc2a53a917251eb9cbf913eaa3ff5292ad31bb867
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host multiple links on disposable domains, likely to distribute malware or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, possibly a downloader or part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 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 http://anabakorea.jp/userfiles/file/95464003527.pdf In PDF document text
    • http://precisao.org/files/files/zadagivepema.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202192732015152.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/33435876460.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615397b97c02e---70813805987.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/75553464617.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/bofetuwubosilunoxiwikedo.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210926202853.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/bac30d232c6678140f363e4d7ff7505c/wunozetujiminu.pdfIn PDF document text
    • http://gptools.net/userfiles/file/sinukusevefan.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109122047124379.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/ximupexefig.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/62991279198.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/26896963500.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/96309599873.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/gajegeriburatokakefu.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/14267693323.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/tumepalaxemeporupopis.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/31536942768.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/rixafogulitugipuzo.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/jirasinomawawupize.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/lopome.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/nenixebonimixuwuzotazal.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/4851590201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+3+gore+cheat+ps2PDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB387 17760 bytes
SHA-256: eb77ebdb1153ac69875ca21759d7b7c0b26675d210346d74135b456a9cce6b65
font_01_sfnt_off0000e152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE152 1664 bytes
SHA-256: c737c1571b827a9af515084efd4d135d2c05ce8763284746c5506df3322eddb3
font_02_sfnt_off0000e93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10154 10740 bytes
SHA-256: ba3b0091f1207b8f56f6406014adde05b69780f63a58c48731726712d0487b83
font_04_sfnt_off00011a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A46 16228 bytes
SHA-256: 6de2e4de3e01fd5ed443d1209e1dacf3a9d2e38faa1ffa722a59a0423b67245f