Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7d5b291b8208fc…

MALICIOUS

PDF

67.8 KB Created: 2021-03-31 19:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c3157024e6717336d4870b29a878c9c0 SHA-1: 570d824d39f06fd783b74e412bde75cd2bf5a8ff SHA-256: 3d7d5b291b8208fc97282d64323001469f5b81cc7f6d042efb3d844caeccf80f
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. 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 0.9996

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
  • 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.
  • 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://lozipotod.ru/wix?keyword=electrostatics+test+review+answers PDF link annotation
    • http://fimewovoko.getenjoyment.net/blanchard_macroeconomics_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378167/normal_5ff5cbbc1b7bc.pdfIn PDF document text
    • http://buzevuzelape.mywebcommunity.org/binusinuxedej.pdfIn PDF document text
    • http://wetepuzasuvuroz.22web.org/jebotejiveminaxira.pdfIn PDF document text
    • http://xuzanuwije.22web.org/42943101747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478928/normal_6009d8eeeaec0.pdfIn PDF document text
    • https://pujawemufupu.weebly.com/uploads/1/3/2/6/132680931/370723.pdfIn PDF document text
    • https://rodinesupogoj.weebly.com/uploads/1/3/1/3/131384539/xugeropejaxizetor.pdfIn PDF document text
    • https://pidufemimin.weebly.com/uploads/1/3/6/0/136054052/8303167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480904/normal_601bd34f882ea.pdfIn PDF document text
    • https://dazuzezabemor.weebly.com/uploads/1/3/1/3/131380892/e35cc99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_ab0202d7814343b59d177a0d6b865547.pdf?index=trueIn PDF document text
    • http://zinezalidoratov.rf.gd/internet_safety_worksheets.pdfIn PDF document text
    • http://rapixojudod.epizy.com/fakudasasujunamenu.pdfIn PDF document text
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_1704eed9dd8a45e38d1e4b10a51878bd.pdf?index=trueIn PDF document text
    • https://a7ed8af5-5e4a-4eaf-98d7-51655494ca15.filesusr.com/ugd/b5c45a_2d11d9b40c164a5a9c7724ef70276c33.pdf?index=trueIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_a3ad41ff96c648f1b747eaa23372a041.pdf?index=trueIn PDF document text
    • http://kaderuzaxaje.rf.gd/adobe_online_installer.pdfIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_012ee69ae2a041bf87fa6c03d4e802b1.pdf?index=trueIn PDF document text
    • https://acda325f-ee3b-40e4-882f-fabc489a6840.filesusr.com/ugd/23b3d3_ff9d5553a44742e19c4cf933be94851c.pdf?index=trueIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_e3152190c09b46df86d71bd977069bc7.pdf?index=trueIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_1f994d9cfdd74407b7f92a23a90f2967.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE64 4900 bytes
SHA-256: 83c5d815830e8ce1e213ced166eecc4b5edeb5f5ffbc87bb35a8cba0caf76f34
font_01_sfnt_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 10068 bytes
SHA-256: db11d520866e51e5efae759b436cde71d11734ad33532090241f85815b48dbe6