Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a36e4586b92688…

MALICIOUS

PDF

99.3 KB Created: 2021-03-22 06:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a6d4b2516e73973c8c5fa9a7c236563 SHA-1: 746c55dfa9a8d4b43884eb836bf132a353e94a7b SHA-256: 49a36e4586b926887d36ee77dabd20725bd1f9680880d0518edd453687d49ca2
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external links, many pointing to PDF files hosted on services like Weebly, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links, likely for SEO manipulation or to host malicious content. The document body contains garbled text and metadata related to its creation, but the primary malicious activity appears to be the distribution of external URLs.

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://pelibifir.ru/123?utm_term=cabal+mobile+force+blader+guide
    • https://laratenin.weebly.com/uploads/1/3/2/8/132816160/9199725.pdf
    • https://cdn.sqhk.co/musutalivun/3ichbG1/cute_black_boy_hairstyles_braids.pdf
    • http://tihefers.online/muroxutigujiteoi4jz.pdf
    • https://defiduzumuxel.weebly.com/uploads/1/3/2/6/132682342/5290378.pdf
    • https://xetusuzumarax.weebly.com/uploads/1/3/4/0/134013097/jetunow_xokus.pdf
    • http://verifybadgehelp.com/vizio_vx32l_remotep6u53.pdf
    • https://cdn.sqhk.co/wodelaganav/Eghjhhc/12970238952.pdf
    • https://zoninezazazi.weebly.com/uploads/1/3/1/0/131070362/fimifewuxavosu.pdf
    • http://xaredazisom.mywebcommunity.org/buruvomeze.pdf
    • http://greatmasters.biz/relimovaxoveloneza14qj7.pdf
    • http://vizilirudigub.getenjoyment.net/tom_clancy_the_division_book_dark_winter.pdf
    • http://sodahub.pro/553955892131vg13.pdf
    • http://ayazshabutdinov.club/the_little_prince_antoine_de_saint_exupery_summary8qg2r.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_6f44357cbad148fdbca57e2eefc92a23.pdf?index=true
    • https://s3.amazonaws.com/widofafane/turbulence_fd_cinema_4d_r20.pdf
    • https://s3.amazonaws.com/donukadizolin/79703402697.pdf
    • https://s3.amazonaws.com/loxopudizus/beps_action_3.pdf
    • https://s3.amazonaws.com/tonisefoteka/tuneb.pdf
    • https://107a3552-ed21-4f5d-95e3-510b6eae4444.filesusr.com/ugd/21bbef_9c7fe9f8f39f4647b423e58f8ed34b3b.pdf?index=true
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_5b7fe5883d46461ab54efc54411c954a.pdf?index=true
    • 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_off00014684.bin
4f67120cc0c37496ec73f594b5c67c4e0b4c39e95ccf963896184b6557bf634a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14684 5208 bytes
font_01_sfnt_off00015824.bin
fe28c64331087fb83a835df2e4549f2cedc9922b39dea3437bb4c80e56538427		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15824 11528 bytes

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