Malicious PDF — malware analysis report

Static analysis result for SHA-256 facda410a52f7585…

MALICIOUS

PDF

81.8 KB Created: 2021-04-30 01:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 226419ccd8c7eac82e41724238bdff99 SHA-1: dec07721446cdb7a6f4e6982e9ead2a42b4e2bf7 SHA-256: facda410a52f7585f9c965f7d0c6576bc360c4ee5a9a9b163ac218c420ff3bf0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to present a fake printer error message to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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=hp+officejet+pro+8620+printhead+error+0xc19a0003 PDF link annotation
    • http://tetiviguxawik.getenjoyment.net/89973496620.pdfIn PDF document text
    • http://fumakonaforug.iblogger.org/49069539158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412767/normal_6052b1b54a877.pdfIn PDF document text
    • https://liwitozawaben.weebly.com/uploads/1/3/4/0/134042828/jitubim.pdfIn PDF document text
    • http://gonisavuxur.iblogger.org/98216953285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_605d4720948c5.pdfIn PDF document text
    • http://lujuvudav.22web.org/jupajopunavi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_6029237d11099.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_603f4f1bc1f47.pdfIn PDF document text
    • http://fumuroruzej.medianewsonline.com/lokupu.pdfIn PDF document text
    • https://linizudozurori.weebly.com/uploads/1/3/4/6/134640128/22bdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_601db99fc16d6.pdfIn PDF document text
    • http://dofegogojewipo.iblogger.org/nipewusuwubexuxonikenazik.pdfIn PDF document text
    • https://kolojadulosa.weebly.com/uploads/1/3/1/3/131397946/60d093e41ecdd3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nojisibi.rf.gd/food_safety_and_hygiene_notes.pdfIn PDF document text
    • http://bevowamudad.epizy.com/arabic_like_english_fonts.pdfIn PDF document text
    • http://kepepisex.epizy.com/22948520686.pdfIn PDF document text
    • http://gajiresidar.epizy.com/notabut.pdfIn PDF document text
    • http://jutufevokozal.epizy.com/how_to_remove_lint_trap_from_lg_dryer.pdfIn PDF document text
    • http://pimizebogo.rf.gd/security_information_report_sample.pdfIn PDF document text
    • http://kagokonutuvep.epizy.com/ubuntu_server_for_virtualbox.pdfIn PDF document text
    • http://kepawomokatuke.myartsonline.com/chuck_palahniuk_lullaby_quotes.pdfIn PDF document text
    • http://xunaruxu.rf.gd/netgear_wnr3500l_wifi_speed.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 6132 bytes
SHA-256: ae72c6c0fbb1ca29286e0abd61bc3b2b19d8f2f5b3f13959cc316336a6ea00f1
font_01_sfnt_off0001114b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114B 11316 bytes
SHA-256: 7c3f621282e782b89cef623c2bb277b7e8ed451e8c04f383eb58584fa90ab786

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