Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e3b33a0899d622…

MALICIOUS

PDF

101.7 KB Created: 2021-09-21 10:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 32fa1714c89726bdfef4aaee39143877 SHA-1: d37380f374094ced737a5bebf3248cdf0d196e95 SHA-256: c4e3b33a0899d622c78253d0b55c877d33504c08a1fcd89c3397c0c6354f431b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://ratoempat.com/contents/files/bunijazigitoz.pdf In PDF document text
    • https://cambodiadriverservice.com/userfiles/file/4126929220.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aa5e519d8b15c8535bbcc513e7de9b7a/68955271622.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/52890841376.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/mokipenupadugisurud.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f46cf614a64e07c647744f339e048476/sibigonofenazavunezu.pdfIn PDF document text
    • http://riversedgefm.com/files/file/70152625658.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/takufaweniwebakez.pdfIn PDF document text
    • https://tuinvandecruys.be/file/woxozuposuvanerexademuk.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/farupuresaleruwasubon.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/wugowufujovog.pdfIn PDF document text
    • http://pasarangroup1.com/contents/files/bemipatumawege.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/33203458263.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/sukilifinuwugovoxove.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/60827548543.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210904103542.pdfIn PDF document text
    • https://ferropula.hr/files/78554009660.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/7159643857.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/virozafizumozuf.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/dibimilopezelitu.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/39203879675.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/1538696591.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/zepitojedilalegakumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+penelopiad+margaret+atwood+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D92 19488 bytes
SHA-256: e9d3b2f95b05ea40ad398317a5d4d485efd985a9a1d50e7f3b73d085ef976719
font_02_sfnt_off0001709a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1709A 10828 bytes
SHA-256: 7d6d089bc62d507e446d55ceecdf1adabf453c4437a151d8284c9b59db70460d