Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b854dbac9390b6b…

MALICIOUS

PDF

69.9 KB Created: 2020-11-30 18:14:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 40873c3457dab5b4cc7108697aa67610 SHA-1: 9273e05f73b1b062ef7974fe02d04959ee508ad5 SHA-256: 1b854dbac9390b6bf4b6a11787cd5358bf726c4b331b6f76fee1b132a43aea8d
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 0.9997

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://traffine.ru/strik?utm_term=mike%2527s+one+stop+jackson+ohio PDF link annotation
    • https://paladagaludoke.weebly.com/uploads/1/3/4/4/134460366/64ae027.pdfIn PDF document text
    • https://jexajopox.weebly.com/uploads/1/3/4/6/134656613/2681246.pdfIn PDF document text
    • https://tubumafipe.weebly.com/uploads/1/3/4/4/134458357/fosufug.pdfIn PDF document text
    • https://modofanapaf.weebly.com/uploads/1/3/4/6/134676621/ee1402676.pdfIn PDF document text
    • https://jololese.weebly.com/uploads/1/3/4/5/134599323/kepopuwozinusul-fijob.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/foxokunejojasek.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/pajukovuxetu/club_penguin_mission_11_step_by_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1503670-c196-48c3-a84c-f7605032654d/gotapikudobogomapugefoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/vozolejifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c653d853-2c0e-493d-8055-7f0712a31c33/20063931856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8863ddc-6f82-4b76-a1ae-4e6122f2b61c/88323154483.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://www.exxonmobil.com/P��ivitt��istavaraliikIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBF 5072 bytes
SHA-256: 4a212d41c31565fd10f868f227693b60a4a8c1f669524d9ae780539628012ece
font_01_sfnt_off0000cf18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF18 11444 bytes
SHA-256: 5a1c09193136a0a5a6f596279d523f5c61c0b23fc040d0bff676ad52a2bc7b09
font_02_sfnt_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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