Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f91cf2b857fa59f…

MALICIOUS

PDF

69.3 KB Created: 2021-04-01 08:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b87aab46f9267a458e23efa06756cae1 SHA-1: 7a651b79783c680a51c21a22713694c160b4a388 SHA-256: 5f91cf2b857fa59f6ab6ab95e9ef29a9a37e2b970b6107af2cb85093f4309721
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, and is identified as a link farm. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a pattern of creating numerous links to potentially malicious or phishing sites. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's used for phishing or malware distribution.

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://vilenefex.ru/wix?keyword=levels+of+organization+worksheet+7th+grade PDF link annotation
    • https://nupepapuk.weebly.com/uploads/1/3/1/4/131484133/45d42fa2334a771.pdfIn PDF document text
    • http://qrastenmap.online/quran_tafseer_in_englishg1gf4.pdfIn PDF document text
    • https://megefutuw.weebly.com/uploads/1/3/0/9/130969536/9479813.pdfIn PDF document text
    • http://rubisteq.online/7219145481218e7c.pdfIn PDF document text
    • http://prizinsta.site/82374558721d8rhh.pdfIn PDF document text
    • http://eeeeeyyy.space/elementary_abstract_algebra_examples_and_applicationsljmp6.pdfIn PDF document text
    • http://itwomen.space/21121400824e6guy.pdfIn PDF document text
    • http://summ-green.fun/dabazosimugabibuvevujauwtsq.pdfIn PDF document text
    • http://ehaberdevlet.com/jilovivizurqp4b.pdfIn PDF document text
    • https://kawuzuke.weebly.com/uploads/1/3/1/6/131606938/suvanoxuxerumiku.pdfIn PDF document text
    • https://wadezirukabag.weebly.com/uploads/1/3/4/6/134668274/worazajibu_fexevajakaza.pdfIn PDF document text
    • http://tokio-2020.fun/doxel1ucfo.pdfIn PDF document text
    • http://vodoroding.info/citation_machine_chicago_manualnorif.pdfIn PDF document text
    • http://gatorama.fun/kufopi25vic.pdfIn PDF document text
    • https://xeropupofusopa.weebly.com/uploads/1/3/0/7/130776394/kinugomunugemo.pdfIn PDF document text
    • http://creditinquiry.info/68211014793sjba5.pdfIn PDF document text
    • https://momewevegugeb.weebly.com/uploads/1/3/5/3/135326076/29cad5f348.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_1e8acf303d694eadac2e686825c78fa4.pdf?index=trueIn PDF document text
    • https://60b161a2-b511-46bc-b48c-7ca4331f2db3.filesusr.com/ugd/34b71b_3ea1bef068f04cc7b43fb099dbb40649.pdf?index=trueIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_a3e9ef72f70b47049960f72c2cf3604d.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_44d2465a1ed94443a0cfbf546e93ce44.pdf?index=trueIn 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_off0000d179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD179 5456 bytes
SHA-256: 8bf0ba535abfe166124932b49dca7e27f9cee22e3fbf3aad4225c05e5dcdcdd7
font_01_sfnt_off0000e430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 10500 bytes
SHA-256: ef9f8152ab59858db0536423475043340b4a50783edcde54f8b5b0c9e47a2616

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