Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b1cf31ff1e3e29…

MALICIOUS

PDF

73.5 KB Created: 2021-03-20 19:37:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa316b1c7400d7c28808ce56bdc34eec SHA-1: 521397343f3d18fcb700a13656b273acf9db3626 SHA-256: a6b1cf31ff1e3e29b8a56606843e163487223aa8d92472d1cf574c84453f34eb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal a PDF containing a large number of external links, suggesting it's part of a link farm designed to direct users to potentially malicious websites. The embedded URLs, such as 'https://vilenefex.ru/wix?keyword=accu+chek+performa+nano+manual+english', are likely used to host phishing content or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=accu+chek+performa+nano+manual+english
    • https://cdn.sqhk.co/pozigafo/idjgdlP/markiplier_e_meme_video.pdf
    • https://latitatuforuza.weebly.com/uploads/1/3/1/3/131398212/998688.pdf
    • https://bawokopo.weebly.com/uploads/1/3/1/0/131070727/valonivupadokotudeki.pdf
    • http://motirepefasake.iblogger.org/impulse_response_or_library.pdf
    • https://zetokefukakebep.weebly.com/uploads/1/3/1/4/131438441/mafomomuz-fudixurumumun-dipeju.pdf
    • https://cdn.sqhk.co/motuvitewodi/ggjfjjr/wwe_universe_mode_tips.pdf
    • https://sosatiga.weebly.com/uploads/1/3/1/1/131164398/5735540.pdf
    • https://ziwagunu.weebly.com/uploads/1/3/4/8/134883986/c5893b9b604c9.pdf
    • https://bukivobiwizu.weebly.com/uploads/1/3/4/0/134097020/3917140.pdf
    • https://cdn.sqhk.co/gepeduvo/WiemZha/vajofepevebegelapumomado.pdf
    • https://zamovolipizutuj.weebly.com/uploads/1/3/1/0/131070940/fb0cc657f7.pdf
    • http://naguvogegexaze.22web.org/sociolinguistics_by_hudson.pdf
    • https://fadefufogu.weebly.com/uploads/1/3/5/9/135960472/f6ea1549febe9.pdf
    • https://cdn.sqhk.co/kerodamajop/hhbIfrX/9473110201.pdf
    • https://nujawarasut.weebly.com/uploads/1/3/4/3/134310583/a5e8595e804b9eb.pdf
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/1190262.pdf
    • https://wopuwidutava.weebly.com/uploads/1/3/5/3/135322166/borekimek.pdf
    • https://wobubowez.weebly.com/uploads/1/3/4/7/134709338/xonawunilewetorik.pdf
    • https://cdn.sqhk.co/xuxinugad/iiiciiW/kutomisegimixegukuj.pdf
    • https://pesefusuf.weebly.com/uploads/1/3/4/4/134486856/lujuvuvobibewe_pusopufovopu.pdf
    • https://gibuximo.weebly.com/uploads/1/3/4/6/134665594/konolizane_xutotisod_nupov.pdf
    • https://cdn.sqhk.co/voguzasijur/ghighhn/57482939813.pdf
    • https://rozuguki.weebly.com/uploads/1/3/0/7/130775318/bifupixif_gewini_kajuruvebaruri_fadinifapoluju.pdf
    • https://cdn.sqhk.co/zadirajuviku/7je79jb/7638390484.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://javewexo.epizy.com/bible_wonders_in_telugu.pdf
    • http://lemibutudigosuv.rf.gd/badeb.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4c.bin
f8549c5baaf307bdcbb10692a9377b5be99ed250071f71f97b72724bb7fd48db
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4C 5480 bytes
font_01_sfnt_off0000efca.bin
4bb47b02a469372b854f72fa40b1122a270c9554af23a16be02a634f95b165ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 12968 bytes