Malicious PDF — malware analysis report

Static analysis result for SHA-256 78869f6265c4e980…

MALICIOUS

PDF

82.5 KB Created: 2021-05-31 12:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0cdb2679a3228c9fe17b123581aa81f8 SHA-1: 29535986f722f34b264c578d23ea4024e8923183 SHA-256: 78869f6265c4e9807f6709e0229bc3b2ac91ac3a61de84e689245801b88194d7
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/strik?utm_term=monsters+university+full+movie+tamil+dubbed+download+isaimini PDF link annotation
    • https://rerararomimin.weebly.com/uploads/1/3/1/3/131383042/netemivexenegil-rewut.pdfIn PDF document text
    • https://jotigafipalat.weebly.com/uploads/1/3/4/8/134896518/07e6d47c02229.pdfIn PDF document text
    • https://jovogivodarula.weebly.com/uploads/1/3/5/3/135325070/gunapusivewobisaw.pdfIn PDF document text
    • https://goxemuneb.weebly.com/uploads/1/3/4/7/134715014/c52307b33d.pdfIn PDF document text
    • https://gaxizizobepebi.weebly.com/uploads/1/3/0/7/130740618/weganem.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4420250/normal_60b24ead63cbe.pdfIn PDF document text
    • https://bosuzegenelulu.weebly.com/uploads/1/3/4/1/134131522/4935318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491665/normal_600ea59786735.pdfIn PDF document text
    • https://pukizorot.weebly.com/uploads/1/3/1/3/131384201/4567d00.pdfIn PDF document text
    • https://fegalovawi.weebly.com/uploads/1/3/4/3/134349911/4629800.pdfIn PDF document text
    • https://pozufijuxib.weebly.com/uploads/1/3/0/7/130775557/405818a9a87c119.pdfIn PDF document text
    • https://tasapeneme.weebly.com/uploads/1/3/5/3/135308717/baraxebujaluguki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/85a0ea41-9118-41d9-baa4-a27ff19df9b7/26969292827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/136f40e0-d2e7-4195-b42c-e2dbb1e8c990/sebililatujanifujum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2b5380f-45e1-4297-ad1c-feb2c4068bff/lawajir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef04b61d-9594-47c0-a528-a1c44e1a6d2d/how_do_you_delete_pages_in_adobe_acrobat_pro_dc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/affcd937-164d-40e8-a7a4-d8e170d51285/mojizezuwuxudasisan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d5c09bd-e09b-4a56-97dd-7351ad7ffed6/taruzerodanorijegik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6426944f-085c-4e0e-92a3-d491c788e346/monster_inc_boo_meme_face.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 5452 bytes
SHA-256: 7d9da98f5b44b7742c1d766db88ca383a996c193afd376cd50dfd53bfb64d301
font_01_sfnt_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 12124 bytes
SHA-256: a2798a1ed7d5921180d341d2d5ff38f85a300d1fdd575e3e2a56f9216be89350
font_02_sfnt_off00011824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11824 10552 bytes
SHA-256: db37dfc9c8f0b4c1fb8d4d928568b1ae29c20d6a96c711c80178820107f5f37d