Malicious PDF — malware analysis report

Static analysis result for SHA-256 4515e40582a6f132…

MALICIOUS

PDF

73.7 KB Created: 2021-02-20 08:32:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: ace4db9433aee4bc19fc389697b81b9b SHA-1: 20aa7e37aa5996c2fe1b3552f5d8385dec8eda13 SHA-256: 4515e40582a6f132a21799fe1f20c3edc61e049381b847be13d549b720272b01
186 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, indicative of an SEO link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://leonvi.ru/strik?utm_term=graphing+quadratic+functions+in+vertex+form+worksheet+answer+key PDF link annotation
    • http://fruktovik.com/net_exam_2018_july_8_answer_key9qbwv.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/4cc3ddcba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5ff4064351594.pdfIn PDF document text
    • https://xibimitavidin.weebly.com/uploads/1/3/1/8/131871740/933610.pdfIn PDF document text
    • http://baffer-shop.space/sugexevokunisowegovox7vo7p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414486/normal_6013bc97c40fe.pdfIn PDF document text
    • https://movireralu.weebly.com/uploads/1/3/4/8/134879142/8753103.pdfIn PDF document text
    • https://garagagu.weebly.com/uploads/1/3/4/3/134364865/lipaluridut_litafironiwe.pdfIn PDF document text
    • http://copyright-infringement.business/selecta_ice_cream_flavors_christmas_2019b79km.pdfIn PDF document text
    • https://gopogusefivow.weebly.com/uploads/1/3/1/4/131406686/fc4767eee78e0b.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/Tii9gh3/field_hockey_stick_length_by_height_chart.pdfIn PDF document text
    • https://zaxefuki.weebly.com/uploads/1/3/5/2/135299090/3bb31c1463424.pdfIn PDF document text
    • https://pejeronasoko.weebly.com/uploads/1/3/2/6/132682646/0a6da7eafdba0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425910/normal_5fd09a576c9e7.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/NhaxjaH/50894902800.pdfIn PDF document text
    • https://cdn.sqhk.co/zitiwofiru/fhg5Vjd/tunitojasabadogerajil.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/vicks_filter-free_cool_mist_humidifier_v4600_white_instructionsxe1fw.pdfIn PDF document text
    • https://cdn.sqhk.co/mekibekowufe/Gjb9idP/my_talking_tom_download_jio_phone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wipitawakewemex.rf.gd/craftsman_chainsaw_18_chain.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_off0000e139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 6080 bytes
SHA-256: c565ffad54d202c61f4a1b1efc2df9d33f853326cfb6bd28732ac6c58edce3df
font_01_sfnt_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 10400 bytes
SHA-256: fa916d294c665af4f7e6321df88d08fa14080386ea3b9a6f331c3c36efc0de40

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