Malicious PDF — malware analysis report

Static analysis result for SHA-256 10621b7a69c3ae12…

MALICIOUS

PDF

79.4 KB Created: 2021-03-02 19:14:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b74667dcdd34827d6354da3025415a18 SHA-1: 3241df1fa4482377d56d0e40ab436014bbf18402 SHA-256: 10621b7a69c3ae12b1ed6844f7640e7464e7d774219462c88fb010d49887083b
196 Risk Score

Malware Insights

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

This PDF file contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the embedded links, http://privateguardingserviceagainstdanger.site/fativafuwasofibj2eg.pdf, is flagged as a random URL, and the ClamAV detection indicates it's a Pdf.Phishing.Trojan. The document body, though heavily obfuscated, appears to be a lure related to 'Easy painting ideas for 9 year olds', suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://maypoin.ru/strik?utm_term=easy+painting+ideas+for+9+year+olds PDF link annotation
    • https://sokifaxus.weebly.com/uploads/1/3/4/6/134666683/c70128d.pdfIn PDF document text
    • https://boxuvudadutubip.weebly.com/uploads/1/3/2/6/132695546/4842563.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475725/normal_6006e8f418293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380682/normal_6011f8505812c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426953/normal_6027de3b013f4.pdfIn PDF document text
    • https://wubuzafovotul.weebly.com/uploads/1/3/0/8/130814439/6188802.pdfIn PDF document text
    • https://wosutazewaxutu.weebly.com/uploads/1/3/0/7/130775331/jixosofujigovijine.pdfIn PDF document text
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/7185980.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/fativafuwasofibj2eg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415937/normal_602be8c5b6210.pdfIn PDF document text
    • https://lejumapufa.weebly.com/uploads/1/3/4/6/134688193/revudagufifuzub_sizinumofexi_kadonivosudatel.pdfIn PDF document text
    • http://rukozhop-guide.com/general_knowledge_quiz_funny9vyvt.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/wexoteluwag/xokeruzi.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/rpg_android_offline_espaol.pdfIn PDF document text
    • http://wekidezeze.epizy.com/videmudulop.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/king_size_flannel_sheets_with_cats.pdfIn PDF document text
    • http://tuzipani.rf.gd/64157347376.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/twitch_guide_jungle_s9.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 5424 bytes
SHA-256: 000d7ccfa798a7fadac0d9eec1db413100565ae1b38a63307923d412304619b8
font_01_sfnt_off00010bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 10876 bytes
SHA-256: 80bbf4387902a4fb5599c8b699f34e4bde89c12e7329cb0aa3c23954e70f935c

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