Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b3f5001aaff656…

MALICIOUS

PDF

85.8 KB Created: 2021-09-24 03:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f6b12c3733e9196ba9452983a01597d8 SHA-1: 8b19ab9a4ebc1ec7ef61c9b18c65502744f0225a SHA-256: 94b3f5001aaff6562884b967c654880ff935b65cbad73e37c171cbdf77a29124
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of many external URIs suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=tips+and+tricks+android PDF link annotation
    • http://jdjcnc.com/upfolder/e/files/20210922170858.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614351f080ee3---46629744697.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-19/20210919023206300919.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/1366683242.pdfIn PDF document text
    • http://industrialdevices.in/uploads/relilofonidiso.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/jezopalabaferapew.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/fepirakexubaxune.pdfIn PDF document text
    • http://methese.com/upload/files/tapepugezewize.pdfIn PDF document text
    • https://sapthagireesyathra.com/userfiles/file/32696498396.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/68621790101.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/341993621.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/jagururujidibajetutolobaz.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/fuwesefetosubawoju.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/babexesawivufog.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/14113479324.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/tulufeleliroziviwepujowo.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/zelesavufabukoxa.pdfIn PDF document text
    • http://tzsunup.com/upload/84968079097.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/97335603232.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/23938773756.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/nepogixekufewizidovasas.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/17231270127.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/rilawudukazevinep.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/tivipibokamaf.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614950f6158a6---40405684190.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 17296 bytes
SHA-256: ca0173a31576765a83ed559fcbf7e73668fee4f9048c224979fe674bc2d18bd6
font_01_sfnt_off000119e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F7 10384 bytes
SHA-256: 4718b62f51f904fa20988230090448aa63ca1edfe6e96f12ec5fbcc350606602