Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94be5c607d49f27…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 15:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2188a1f09ac786339fd13ec8e47334be SHA-1: 3e22a235f31b14ce595cbc5fef2756b2c6cdcd88 SHA-256: a94be5c607d49f27dfd953d0684d8d0e6c59b41861f33d493845eea84f11b4b7
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://toyotaautobody.com/ckfinder/userfiles/files/buxeluluro.pdf In PDF document text
    • https://detector-billetes.com/Imagenes/file/davulo.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/92022320626.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/15302099361.pdfIn PDF document text
    • https://oktatas-konyveles.hu/term_extr/files/wusesomixodorewo.pdfIn PDF document text
    • http://cy2hand.com/userfiles/73034196239.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/fotujozasiniwudoki.pdfIn PDF document text
    • http://cascad-trans.ru/files/jaxojanokojomir.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/viwunik.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/77241761055.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/15330979594.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/28867912869.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/94641098379.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/27621417021.pdfIn PDF document text
    • http://badgerhillfarm.uk/39529820252.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/xuneje.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/xugowujojagu.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/xuvaxipodedawukejubi.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/6847956082.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/segatareripedexifipugu.pdfIn PDF document text
    • http://parentini.it/userfiles/files/63837886404.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/zamuvoviturazidokupumovi.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/tipoxexusorixese.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161416e7c12976---zapamoragisizubirukefab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=talking+tom+camp+mod+apk+an1PDF 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_off0000dfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C2 10564 bytes
SHA-256: fd6ee99fe71f66cf4116fbb8ee567ad7ca6ddc468e35b45d58cc3cf98cdf7d10
font_02_sfnt_off00010fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA9 19388 bytes
SHA-256: 7f07e055f1825c778408c82a806c4ba640ec16ca211b54e3ec90b22c3d1ca368