Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b76d4e6146234d1…

MALICIOUS

PDF

77.9 KB Created: 2021-09-26 04:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bf92dafe5226549be5f746dd92dbd132 SHA-1: 220c4bbab563e732f6d9985e38410ae004e830d4 SHA-256: 8b76d4e6146234d12dc80af0991c38a20326aeda020aae5285c59d4d70f59ff0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

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://pistant.ru/uplcv?utm_term=motorbike+traffic+drag+racing+apk PDF link annotation
    • http://elcolono.net/userfiles/files/96306427155.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/ketawi.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/difavarediwewemapuku.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/56048137851.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/runisos.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/xezejibubur.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/31036777680.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/33680740200.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/99364049132.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/josulewejewiwina.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/vofimidinoziro.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/56895349811.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/bagurino.pdfIn PDF document text
    • http://markone-tools.com/upload/files/29996937788.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/43214820327.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce453abe44---58401630025.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/63044793077.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/96982322044.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/sidafisafonubakazofax.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/73501428588.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/nunaguresiw.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/rowuganene.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/gapalizukub.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/76961682240.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/jinositosa.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/mijedipavejedijami.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33D 10804 bytes
SHA-256: 7b2f6a4f82878be26d59e4802fdc54213a1c472f5122bd202326fcf15877df32
font_01_sfnt_off0000cbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EC 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_03_sfnt_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 18992 bytes
SHA-256: 7b9611920cd3ae754496b634b425669fd1ff73bf972f7d347e1aef53cbe33551