Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c62fea59c6e21f8…

MALICIOUS

PDF

93.4 KB Created: 2021-09-13 15:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa1faa5a1d15ef29c972966db91fc7bd SHA-1: 698b4b07fb89bb9cd4fa3966d726cbe448c1c0b8 SHA-256: 8c62fea59c6e21f8c973033d411d52199596f36005fa12b329c603f1cb2ce3a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/58954505275.pdf In PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/dasaganawotol.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/32585934464.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/wopisepezemanujisus.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/16187050085.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/79445329096.pdfIn PDF document text
    • http://pjteam.hu/uploads/gujerazam.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/14573055012.pdfIn PDF document text
    • https://digireg.se/upload/wubupozep.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/torabifurosezazovumopaji.pdfIn PDF document text
    • https://partetesal.ir/data/file/74094829520.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/vawutomuvapafaxaponuxipu.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/jeroziz.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/fawanirubazuduluzate.pdfIn PDF document text
    • http://stonebreaker.at/49661022840.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/1u7fcmf0b39r23ph4o4o8ce784/nozigetatosupomok.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/mokup.pdfIn PDF document text
    • https://airbays.com/userfiles/file/xafamirotatujikej.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/fixukaranimurujofilav.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16137ec64eaf4d---65323653233.pdfIn PDF document text
    • https://el-tall.pl/pics/file/bebiroguteranuvikexidelis.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/54884433472.pdfIn PDF document text
    • http://uteambio.com/upload/files/98079891769.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109082304527417.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/semeselezikipelomipotoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=relationship+bible+study+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_off000107a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A8 18188 bytes
SHA-256: f7d8108a2743336734deecd33952213f85e85db0365c76d9a73494a97ee33878
font_01_sfnt_off000136b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC7 10896 bytes
SHA-256: 2b3c072a77170017070b253d14a53e4bdcab2062be29267fc02f56a8ee986b83

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