Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc212cb27a614fe…

MALICIOUS

PDF

75.6 KB Created: 2021-02-23 08:32:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9f135bfb47c3d607eb70ec16c55dc8d0 SHA-1: 9fde2295fee8627a97af0ce00b1799a20900cf6a SHA-256: cbc212cb27a614fec86cd5fe62c32bd37df87e4ff9aeb2b3bdbb9eb34f219731
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://crophysi.ru/123?utm_term=what+is+california+association+of+realtors PDF link annotation
    • https://cdn.sqhk.co/nidaruzada/cMjJGja/8672072404.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/jyPgcCt/crunchyroll_naruto_shippuden_143.pdfIn PDF document text
    • https://nutipofuvi.weebly.com/uploads/1/3/5/3/135310868/3264561.pdfIn PDF document text
    • https://zisibunekotif.weebly.com/uploads/1/3/4/9/134902626/fubaxo.pdfIn PDF document text
    • https://nunibuzobaga.weebly.com/uploads/1/3/0/7/130740367/guzipedin.pdfIn PDF document text
    • https://gidorimafemona.weebly.com/uploads/1/3/4/8/134867851/pawowomogevet-jatogesav-xopome-sogilevexum.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/gurupixabogivaz/ethernet_cable_color_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/muroxajulegowezafajeris.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/gozedoxawizefapa.pdfIn PDF document text
    • http://bonoburadik.epizy.com/22874738233.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/nekivokukedewazamolokop.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/bikab.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/bigg_boss_telugu_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/5447093805.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/constitutional_amendments.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/hot_work_permit_template_ontario.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 4980 bytes
SHA-256: 99f30a50e0c74fc9d127e7f6608782805fb4f4b98cdc12929944d9bdd8caf0cd
font_01_sfnt_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 11312 bytes
SHA-256: 902d8717bae524ed1b76d4150dcb8d57d1787e11decdc673adadf2b4a8778d83

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