Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b02fc8aa08fc3af…

MALICIOUS

PDF

79.5 KB Created: 2021-03-28 00:58:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3f65f1ef4cd8f653b867a1333c131225 SHA-1: 141cecfe540206fe56ad8e647ced6ecce300f79e SHA-256: 4b02fc8aa08fc3afefc91f877ebf75a93aa607e28e8642c6c1161734154a2483
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=middle+school+choir+warm+ups+pdf PDF link annotation
    • http://fanogizakelime.iblogger.org/78495165651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_605d5eb1b487f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446045/normal_603d5cfa62024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_6049ae4dd8818.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_5a57af47d58d4fb18ac8742d29899602.pdf?index=trueIn PDF document text
    • http://luruloligof.rf.gd/metuxovadapijege.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_6ba431aa47954843af3e10ee27280834.pdf?index=trueIn PDF document text
    • http://xubivinonoloru.rf.gd/the_bet_short_story_theme.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_91a86c32a8ef45d3957b9af4f500e906.pdf?index=trueIn PDF document text
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_0fb372c8d6074a828792bd927e735cda.pdf?index=trueIn PDF document text
    • http://fawexoja.rf.gd/kiniwenazexa.pdfIn PDF document text
    • https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_f90c2e66d741420ea302df19f6ff3b10.pdf?index=trueIn PDF document text
    • http://moganip.epizy.com/45688131099.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/36303790417.pdfIn PDF document text
    • http://wemopax.rf.gd/banking_syllabus_download.pdfIn PDF document text
    • http://laroruteze.epizy.com/chutkule_ing_mp4.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_55650e874aae4f94bd0f344aa29a422a.pdf?index=trueIn PDF document text
    • http://jiporiri.rf.gd/40953012507.pdfIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_d581b02acd7449cf8d672db167335d81.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/19786985392.pdfIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_95254c74e115434daeef2bdcf53b2ca6.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_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 5492 bytes
SHA-256: a0ae9fbcb50670ed50dfd0c574cb0282544ad1d42fe0a99fd4a181d045a2bce0
font_01_sfnt_off0001091d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 11040 bytes
SHA-256: 0ba67292eaf025019304b0af12b41dc79599b5b15addc7990bccc3131417c0dd

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