Malicious PDF — malware analysis report

Static analysis result for SHA-256 4859658f80d6cbac…

MALICIOUS

PDF

86.0 KB Created: 2021-05-19 19:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b5c83f38dc4b8169cf6fde4a0ad9637d SHA-1: b3e8111f8eb9abe2a8bfa0bae2734c649991d50a SHA-256: 4859658f80d6cbac73e3d019f8543bd8a7552fcf3bce2b02d39c2fdd75cacff0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The presence of a large number of external links, many pointing to PDF files on file-sharing services, suggests a link farm or redirection mechanism. The document body, though partially corrupted, indicates a lure related to a book summary, likely intended to trick users into visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://xezojetit.ru/strik?utm_term=alicia+en+el+pais+de+las+matematicas+resumen PDF link annotation
    • https://tejovobomogopiz.weebly.com/uploads/1/3/4/6/134626725/tupiwaxezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467927/normal_60501200dec90.pdfIn PDF document text
    • https://mizemajawoxulu.weebly.com/uploads/1/3/1/4/131437858/2252283.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/gexifum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405946/normal_6026acd5ab633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404108/normal_6055c7fd2e716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_603448171e3b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369657/normal_60581d1bc03ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373301/normal_603269b1daeaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475375/normal_6068903a55a47.pdfIn PDF document text
    • https://fosuwelu.weebly.com/uploads/1/3/2/6/132695698/1776a611d0919.pdfIn PDF document text
    • https://remejatezikame.weebly.com/uploads/1/3/1/0/131070309/8648545.pdfIn PDF document text
    • https://zajodufukotu.weebly.com/uploads/1/3/1/8/131857357/zenofik.pdfIn PDF document text
    • https://fiwatinizajof.weebly.com/uploads/1/3/0/8/130874156/tonijanosiparofixuna.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446170/normal_5fd086a114bc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422879/normal_5fff26f8243ef.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/lunojol/piwematatuguwamepofetofab.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/cisco_asav_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/94856118169.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/adobe_photoshop_elements_10_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/45427599273.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/99095517401.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/bevixi.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/putting_on_the_full_armor_of_god_everyday.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_off00010f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F73 5208 bytes
SHA-256: 12d76629881fe9bb61affa4f0cfc14c95a79fe64a10df776c5d9d2dfe86888b1
font_01_sfnt_off0001210f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210F 12108 bytes
SHA-256: f4199cde6337c662182fdb918b8bddca38c06632c7f03787cc997540dfc767ac

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