Malicious PDF — malware analysis report

Static analysis result for SHA-256 360465b7beab2069…

MALICIOUS

PDF

83.4 KB Created: 2021-03-05 16:01:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 76a05c110d98d124ce33c4719c3de4d1 SHA-1: ebaf5624296f12d76c0d86d6674f800a2cc7de10 SHA-256: 360465b7beab20695ddc9cf68f3fdde6973534a266798922df11358ec737eec9
186 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://ponafet.ru/wix?keyword=section+20.4+electric+circuits+answer+key, appears to be a lure for search engine traffic. The document body is heavily obfuscated and contains what appears to be metadata from wkhtmltopdf, but no direct malicious script execution was observed within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/wix?keyword=section+20.4+electric+circuits+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422906/normal_6017c6965b0c9.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/7189074.pdfIn PDF document text
    • https://gisodotok.weebly.com/uploads/1/3/5/9/135971357/bijivimu.pdfIn PDF document text
    • http://didopikorubozav.iblogger.org/esl_worksheet_for_kindergarten.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/hgejeXH/conquest_word_meaning_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvotalek/CvkjbtE/legabelusagusun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480899/normal_603d8c0aa6279.pdfIn PDF document text
    • https://cdn.sqhk.co/satijumok/qig7Oja/xedoripebumedujugunadi.pdfIn PDF document text
    • https://resigigemi.weebly.com/uploads/1/3/5/3/135326159/xixevapi_pegonako_zifas.pdfIn PDF document text
    • https://zuxibonidape.weebly.com/uploads/1/3/4/8/134889984/60d924f9.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/bhigjQ5/33916661223.pdfIn PDF document text
    • https://toxozuduz.weebly.com/uploads/1/3/5/2/135295771/worelimosobobizepem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366359/normal_602af55c159b1.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/jdBw3hi/jibetanikidan.pdfIn PDF document text
    • https://wojanoxunoliwam.weebly.com/uploads/1/3/5/3/135394081/5e8c093acad23d.pdfIn PDF document text
    • https://fazugiwe.weebly.com/uploads/1/3/4/0/134012697/xilosadepigagamu.pdfIn PDF document text
    • https://vaseviga.weebly.com/uploads/1/3/3/9/133986607/siwaset.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/40157631132.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/niforopiz.pdfIn PDF document text
    • http://fobupozomorefiw.epizy.com/paec_job_application_form_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/family_tree_worksheet_for_elementary_students.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/64998158024.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/zopugo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 5548 bytes
SHA-256: 857c1f4853ad105f3fcf96b0aa6d87a0c4685bbddf8539b5b3e0453224883733
font_01_sfnt_off0001030a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 11564 bytes
SHA-256: 1656f7d45bd62c90c5f6f72275af1777a2fc6e21d4db84956fb4d4d04392c81e
font_02_sfnt_off00012a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A87 16220 bytes
SHA-256: 688fa5f8d037ce6d16aadc8ad53fd29e0d28d660a89563b5e30a84293ca90779