Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0cc358f8620f8e…

MALICIOUS

PDF

87.6 KB Created: 2021-03-16 06:57:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1519e9fe1c95c5d116be450f0b5e061c SHA-1: 399d5ff969d15db17c418239729fe128fa3009c0 SHA-256: 7b0cc358f8620f8ed4f5504dc772477011839267c87c07a6b4d2b89f8a1751eb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a large link farm detected by heuristics, suggesting an attempt to direct users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common phishing or malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=edenton+nc+private+schools
    • http://monstergym.ru/where_to_buy_summer_waves_pool9kjms.pdf
    • http://bbcua.site/wefiwigubizore3t2o3.pdf
    • http://vnds-super.space/football_referee_shirtsrcw63.pdf
    • https://desebenenoda.weebly.com/uploads/1/3/5/3/135348916/3f780b3139ce7cc.pdf
    • http://zespodsvetkoy.site/how_s_it_going_yahoo_answersmdwyq.pdf
    • http://autobaff.xyz/xemavakovutunagenotoju4qg33.pdf
    • https://zotagozugub.weebly.com/uploads/1/3/0/7/130739891/1801494.pdf
    • https://torudedo.weebly.com/uploads/1/3/4/3/134352944/botalet.pdf
    • https://ruzudagozigiwis.weebly.com/uploads/1/3/5/3/135394236/popolixekexubowoli.pdf
    • https://cdn-cms.f-static.net/uploads/4490949/normal_60500f0959fe6.pdf
    • http://kipokefurur.mygamesonline.org/digital_electronics_gate_questions_answers.pdf
    • https://xokizaneg.weebly.com/uploads/1/3/4/8/134886830/3830551.pdf
    • https://static.s123-cdn-static.com/uploads/4471253/normal_5fef09f8b8e55.pdf
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/pejuwazemupibu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mijumomub/kironitejabadojan.pdf
    • https://s3.amazonaws.com/miledu/86082226166.pdf
    • https://s3.amazonaws.com/jinotugiwomo/osaka_castle_park_japan_guide.pdf
    • https://s3.amazonaws.com/wibedubosateg/tonulilifuzegavunuvazovig.pdf
    • http://jimomurapujivo.onlinewebshop.net/zuvabim.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b8c.bin
76a19c678cd24892044c6fd345ea56cf2f71c9fd17e863bf2a5388131ca6b03d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8C 5176 bytes
font_01_sfnt_off00012d29.bin
104fc4309c7c49a2bde07e8461dd651109fe48cdfb9425353f869c6af625acce
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D29 10684 bytes