Malicious PDF — malware analysis report

Static analysis result for SHA-256 63de3103f4ac69c5…

MALICIOUS

PDF

71.9 KB Created: 2021-03-17 22:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0eee1e191d1abe5264bcc3edc4cdcfc4 SHA-1: dcf358800b56994449fd1e02967751d70d2cc902 SHA-256: 63de3103f4ac69c5dff3baf7736ca43a24432f3cc173287ee7da25e4e275602e
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to manipulate search engine results or redirect users to malicious sites.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/wix?keyword=area+code+1112 PDF link annotation
    • http://molufipet.sportsontheweb.net/apostrophe_worksheets_for_grade_6.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/42692688136.pdfIn PDF document text
    • http://sazulido.medianewsonline.com/ancef_davis_plus.pdfIn PDF document text
    • http://rokexulom.22web.org/jeopardy_game_board_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_621e210eb9b14bcca2c6e5fdf10c00d2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lulelepese/subletting_agreement_template_ireland.pdfIn PDF document text
    • http://tevaluzax.atwebpages.com/74941110133.pdfIn PDF document text
    • http://najexenij.onlinewebshop.net/nietzsche_beyond_good_and_evil_free.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/zasatajifexowakijovixu.pdfIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_a5923cc8e649422c97cb86790c63be65.pdf?index=trueIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_60d6f2ce50254c84b3338804490afc81.pdf?index=trueIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_4fbc8a8fae6d4616a7a95c425fa39bee.pdf?index=trueIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_4db651d301994b82a6323ac7fc009be4.pdf?index=trueIn PDF document text
    • http://zunimesigo.rf.gd/argala_stotram_in_telugu_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/comparing_fractions_worksheets_grade_5.pdfIn PDF document text
    • http://pujumek.myartsonline.com/96763613975.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/duzutovugokowawal.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_off0000ddd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD3 4896 bytes
SHA-256: 90b95d1ca1395637070cc78cd33c73de4adc4e59b64f868ac3be4cb2a72bbb8d
font_01_sfnt_off0000ee88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 10740 bytes
SHA-256: 72df10ac5f0b573bfdddc4962d59a560a9930459c8744dc2e5bb158d8b597321

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