Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76dae98593c5ba7…

MALICIOUS

PDF

76.0 KB Created: 2021-01-10 20:15:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 945119ddb304b8d6bc3dfc8401d2e605 SHA-1: 7051b3ec82e7666ac263115ca1396c284ff3f868 SHA-256: b76dae98593c5ba783bd91a74e2c1ba824b100955367e295cc20e8a7a1729472
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to SEO-optimized PDF files hosted on various platforms. This behavior is indicative of a link farm or a phishing campaign designed to drive traffic to potentially malicious content. The ClamAV detection and ML classifier further support the malicious nature of this file.

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://trafftec.ru/123?utm_term=c%252B%252B+interview+questions+for+experienced+professionals PDF link annotation
    • https://site-1174534.mozfiles.com/files/1174534/cooking_cod_in_oven_with_lemon.pdfIn PDF document text
    • https://site-1206032.mozfiles.com/files/1206032/79871130837.pdfIn PDF document text
    • https://cdn.sqhk.co/xarobumevux/hzfijhi/clash_of_clans_private_server_gems_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/jhijjl8/tufanebatori.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/cVjJvia/bumisupumawepeladetipofaf.pdfIn PDF document text
    • https://fifowekuvepu.weebly.com/uploads/1/3/0/7/130776735/26b09.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/gapovowumepekegosiza.pdfIn PDF document text
    • https://cdn.sqhk.co/zewuxumaro/jjjeicZ/63340562084.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/0gcb1Ka/xebav.pdfIn PDF document text
    • https://cdn.sqhk.co/fevubito/hiOsOJv/cultist_base_sentinel_battery_2.pdfIn PDF document text
    • https://cdn.sqhk.co/bofilewidil/jiWgio2/7371369667.pdfIn PDF document text
    • https://cdn.sqhk.co/xigofidiw/h38Hpgf/wwe_royal_rumble_2016_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/jgignge/rubbish_rap_vocal_ease_more.pdfIn PDF document text
    • https://tunuwowidu.weebly.com/uploads/1/3/4/6/134606858/162196.pdfIn PDF document text
    • https://site-1084153.mozfiles.com/files/1084153/youtube_escuchar_musica_gratis_de_los_80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000de2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2F 5400 bytes
SHA-256: a53937c5463987dd259ecdafbfc067a33a6fbe4d69af272ded4b93b72d4d7178
font_01_sfnt_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 10684 bytes
SHA-256: d489828deeaa369b6c408e1b3e7cf94aafb4934626fd9257aaa8e815b910cd73
font_02_sfnt_off000114ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114ED 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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