Malicious PDF — malware analysis report

Static analysis result for SHA-256 0128a6da4f7b087a…

MALICIOUS

PDF

91.5 KB Created: 2021-03-14 09:52:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 007ca67ae47256891133763c4c7ebdf0 SHA-1: 0e2b0ce14e0caa1c3ede3880929b78cff8ed5217 SHA-256: 0128a6da4f7b087a49aa3c39700b62a017065a9d98976d068a109f08c9033a3a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. This suggests the primary purpose is to direct users to potentially malicious websites, possibly for phishing or SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, and the presence of embedded URLs aligns with this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://druttle.ru/award?keyword=aiou+solved+assignment+code+1424+spring+2020+pdf PDF link annotation
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/4873559.pdfIn PDF document text
    • http://helpcopyright-service.com/crafty_crab_menu_alexandria_va4cmwz.pdfIn PDF document text
    • https://gogadumipoti.weebly.com/uploads/1/3/1/0/131070618/lereforefuzo_xuzete_dujanikis_temupipixutas.pdfIn PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/c3898a015ebe555.pdfIn PDF document text
    • https://vorupegesozuzow.weebly.com/uploads/1/3/1/4/131453293/lomovebirepupim.pdfIn PDF document text
    • https://malosana.weebly.com/uploads/1/3/5/3/135323031/6437497.pdfIn PDF document text
    • https://rezezeveg.weebly.com/uploads/1/3/1/8/131871466/49d7afdea953c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470228/normal_5fcc454a38f5a.pdfIn PDF document text
    • https://fipuwetula.weebly.com/uploads/1/3/3/9/133997959/2736534.pdfIn PDF document text
    • https://tosofovopige.weebly.com/uploads/1/3/3/9/133998067/38662.pdfIn PDF document text
    • https://dopakuxapat.weebly.com/uploads/1/3/4/8/134895633/kafomum.pdfIn PDF document text
    • http://udilische.club/unearthed_arcana_ranger_dndbeyond3kbon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417327/normal_5fc8d40fc4c86.pdfIn PDF document text
    • http://whysmall.space/amazon_kindle_unlimited_subscription_offergt1lh.pdfIn PDF document text
    • http://dimax-matrasy.ru/bagas31_pes_2020rmd9t.pdfIn PDF document text
    • https://kibaranelon.weebly.com/uploads/1/3/4/5/134583153/loniwuwerogororuxol.pdfIn PDF document text
    • https://buxodofuluni.weebly.com/uploads/1/3/4/8/134875319/36d74e8.pdfIn PDF document text
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/ponupoga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000145c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x145C9 17648 bytes
SHA-256: c873b0fbfc573b96f31a421adb3c676556093ec840d1cd28af57d46abaa388a2
font_00_sfnt_off00010ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACE 5936 bytes
SHA-256: bd20dc7dc34ed47c8e63ce9efa09742ce2ea1466aa311225dac6a85c85ab8afb
font_01_sfnt_off00011f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F04 11352 bytes
SHA-256: 51ea8e449d2e2166c0a8843aaa2b8d99c017d50f0c915a89f736331e67821d9c

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