Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb379684aac549c…

MALICIOUS

PDF

81.5 KB Created: 2021-03-25 02:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03efd1978c86de0b89cf928550b8fd18 SHA-1: 568b4d6544e100ba26d9721959121794062dda16 SHA-256: 1cb379684aac549c2e0dcb618a0ff2c5f6bef72c2ec8375edbf58f9f38f5d032
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO spam. The document body, though heavily obfuscated, appears to be a lure related to technical queries. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection, strongly suggests malicious intent. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/wb?keyword=how%20to%20see%20log%20table%20for%20single%20digit%20number PDF link annotation
    • https://cdn.sqhk.co/simikitivo/gibRdLR/marco_takeaway_southport.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/qiiTpih/sammy_robinson_nick_instagram.pdfIn PDF document text
    • https://cdn.sqhk.co/xisofofumew/lphegeQ/silefokexubasi.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/spoken_english_speaking_topics.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/c68030382b12.pdfIn PDF document text
    • https://vomizovuzib.weebly.com/uploads/1/3/1/6/131637161/wulewunewibutap_rugut.pdfIn PDF document text
    • http://dorugatutaxovi.scienceontheweb.net/74905603073.pdfIn PDF document text
    • https://cdn.sqhk.co/denirinodo/hahggWx/jeduvezobidemewuregepanif.pdfIn PDF document text
    • https://tunoritusaw.weebly.com/uploads/1/3/5/3/135328070/d84070ced269.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/gf7wicQ/linujeba.pdfIn PDF document text
    • https://ligefunodimab.weebly.com/uploads/1/3/1/3/131398292/e07a4505.pdfIn PDF document text
    • https://cdn.sqhk.co/ribegibonot/jbicwhd/3972703015.pdfIn PDF document text
    • https://gisunada.weebly.com/uploads/1/3/1/4/131409009/pafurosezu.pdfIn PDF document text
    • https://cdn.sqhk.co/doxanusubomo/jjhdMJU/35650703773.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/jeevan_lakshya_833_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/wgjggjj/38719615719.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/what_is_a_digital_communication_specialist.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/ggXOmOI/usa_chat_and_dating_app_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vatofemurilepa.rf.gd/xitat.pdfIn PDF document text
    • http://verafewema.rf.gd/18713169684.pdfIn PDF document text
    • http://wemiwapava.epizy.com/kajopomagujinomo.pdfIn PDF document text
    • http://vijelovisisojo.rf.gd/apophatic_theology.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_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 5420 bytes
SHA-256: b9fb6dc528fad6bf383726c69b4fc65975f5174501b872b218b2db9294ed5cc5
font_01_sfnt_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 11072 bytes
SHA-256: 8582b18c0d002424c2fada4521f15495d23144ff180c34c60718244b84fa08bc
font_02_sfnt_off000121f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F1 16452 bytes
SHA-256: 43254fff9a4dfcaf8da60cc5a0798b58f664fc6a25eeca85876ce735ff24923d