Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc5ad2cba49719d…

MALICIOUS

PDF

125.7 KB Created: 2021-09-15 16:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 62b14ce6c0bbf048db6ca34c583c3ab7 SHA-1: a4c21a6ef13b991fffe395fd7eb56a20f399acc8 SHA-256: ebc5ad2cba49719dd58449437a9b4a48e948b17d86021a4010321330263bc808
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a machine learning classifier and ClamAV, with heuristics indicating it functions as a link farm pointing to numerous external PDF files. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly implies an attempt to redirect users to malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://bukvoznaika.ru/ckfinder/userfiles/files/faratujuvomugimigu.pdf In PDF document text
    • http://exmar.it/foto_fck/file/dazapapasagenovi.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/belivawujowimizoduwu.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/44588155889.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/10744640681.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/96684216604.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/47635472082.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/78495156586.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/56788882780.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/lubig.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210911130331.pdfIn PDF document text
    • https://dm288.rs/slicice/file/xuniritararemiwa.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/75657089257.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/249d4e8901b97186f3e84f5c98674830/jutikivawerimifutemazewu.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/jurugonazusuferufugamakuv.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/zapabeb.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd574db014---dumum.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/86379838579.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/85994609736.pdfIn PDF document text
    • http://iccarrentals.com/files/file/bopofemixukodoxuru.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/nozabise.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/xikubimekanadut.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/pujolawiluvumobedotanoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sharadiya+shuktara+2018+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16494 22496 bytes
SHA-256: 84bc9be3073b7f88f14dea8fdf1cafd60622fe9ae966e390a01abc4f028a3261
font_01_sfnt_off00019f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7AC 16432 bytes
SHA-256: 6886318e6218e1fcd026638dbee99acbeb6dbb33c804dd0df22126ee37f015cd
font_03_sfnt_off0001ce4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE4F 11076 bytes
SHA-256: 4248391437a94790a5ba518d63fd36df135434d0a2f27d016ab7bbc1241ef8d5