Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad76adddf02a3ebb…

MALICIOUS

PDF

86.4 KB Created: 2021-04-21 08:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 524db16c5e909a453fa26bc07140f27a SHA-1: 50c3315a48055fcff2f778223b64265d9863bfb8 SHA-256: ad76adddf02a3ebbe5dd0de22fa6ea64aaa36a92eee7aacbc40a4ac3cd2f4283
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a seed-phrase/secret-recovery lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://dafemum.ru/strik?utm_term=cloud+computing+tutorial+for+beginners+cloud+computing+explained+cloud+computing+simplilearn PDF link annotation
    • https://vegerezunu.weebly.com/uploads/1/3/6/0/136053786/ca3d48aecd02f2.pdfIn PDF document text
    • https://kilizilefepik.weebly.com/uploads/1/3/0/7/130775254/56487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376602/normal_601f5b479e0e8.pdfIn PDF document text
    • https://zolotamazuragif.weebly.com/uploads/1/3/2/7/132712333/junezabu_nusinuwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388174/normal_600303a633090.pdfIn PDF document text
    • http://fawaxifiwuzodil.scienceontheweb.net/nimugugovitonix.pdfIn PDF document text
    • http://kirivil.iblogger.org/wuniwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_6050d861bac21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478669/normal_5feb604f771e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_6025dc2d16568.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417523/normal_5fcea9e5946c8.pdfIn PDF document text
    • https://xejigidusulup.weebly.com/uploads/1/3/4/7/134730122/3085200.pdfIn PDF document text
    • https://resagivet.weebly.com/uploads/1/3/1/3/131383325/rabujumefiwaj.pdfIn PDF document text
    • http://toworugesolur.getenjoyment.net/50325844411.pdfIn PDF document text
    • http://xubajur.mygamesonline.org/definition_of_policy_analysis.pdfIn PDF document text
    • http://lulamugateso.mypressonline.com/dofovegoxelenisu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455183/normal_5fe41dace5761.pdfIn PDF document text
    • https://jimukara.weebly.com/uploads/1/3/4/2/134235432/3154824.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://titarejidawe.epizy.com/albert._io_answers_ap_economics.pdfIn PDF document text
    • http://milubelivuk.epizy.com/gozepudusufeziweva.pdfIn PDF document text
    • http://zakefuki.myartsonline.com/10057169909.pdfIn PDF document text
    • http://kaxegukepoxar.rf.gd/mawirunozizegiroput.pdfIn PDF document text
    • http://gusutawidike.epizy.com/how_to_add_zotero_to_word_2010.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://scripts.sil.org/OFLIn 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_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 5588 bytes
SHA-256: 4c568598dff1b28d70165f23f4fa5bfdd017c0f28757aced4aeff4a14402b87f
font_01_sfnt_off000100a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A3 3916 bytes
SHA-256: 1a1294b271b1f8f0a6006dbebd935f48285b57b80bab1f9ca2751f219db09bd8
font_02_sfnt_off00010f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 10676 bytes
SHA-256: 8197a64e6d221e7b3edcb3124f07add0b205dbe8c1e1c824dd702a1c0c644df5
font_03_sfnt_off0001341b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341B 16396 bytes
SHA-256: 9461d6da21bc06779bca23cc8191eccb698350e0f039db9567cf94e27cb1e07b