Malicious PDF — malware analysis report

Static analysis result for SHA-256 475210f44a6d047d…

MALICIOUS

PDF

69.7 KB Created: 2021-01-28 04:46:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ae53ae8c0df159e85d0d106f37d48c42 SHA-1: 622b47d5872b24aa66a03abd3614245ae5029a21 SHA-256: 475210f44a6d047d307079bf95bfc359f13cb658f40e5fa941a4965a02593ac7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, directing users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wb?keyword=skate%20art%203d%20%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C PDF link annotation
    • https://nokaxogu.weebly.com/uploads/1/3/4/5/134520383/vapubezofab-zafob-zoxinevepazi-pavedabetazin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417315/normal_5ff0e5c20e12b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467589/normal_5fd26e312ee38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403422/normal_600dcd3e6f61b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481173/normal_5ff457506cc91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412379/normal_5fe32072b59ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450034/normal_5fcd7b6f4a39f.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/9178642.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383794/normal_5fde46efcf1a9.pdfIn PDF document text
    • http://hushseo.online/monster_busters_ice_slide_on_facebookqn0dk.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
    • https://s3.amazonaws.com/vasofirida/idsa_mrsa_bacteremia_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/calendar_template_october_2019_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/capitulo_3b-_1_realidades_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/backgammon_free_for_windows_8.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_off0000c4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F3 5096 bytes
SHA-256: e0849a2ddfaa05587d92d1e45642680ba50f178ce5bfe7e0bb66e4edc554e389
font_01_sfnt_off0000d5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C5 10864 bytes
SHA-256: c0adc9e943d2a30abb8266691ebe4e83ef2c4a3fdddb4553090f61d9d0bec016
font_02_sfnt_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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