Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e7f92d50a4dfcf…

MALICIOUS

PDF

75.3 KB Created: 2021-03-13 14:54:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7e33763116784d9f9134455208b5a7b9 SHA-1: 266e72df2a7305e93ebd2699fd33d24d5d451e5b SHA-256: d5e7f92d50a4dfcfff90912ce96903fbe29b8968d2dc3d8bdd793f58ada044ab
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be related to lesson plans, a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/strik?utm_term=inside+out+and+back+again+lesson+plans PDF link annotation
    • https://tupedofezelazib.weebly.com/uploads/1/3/4/3/134368784/9301076.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/1fabc6df9787.pdfIn PDF document text
    • https://vinetiwufo.weebly.com/uploads/1/3/5/3/135305890/semotadotakeziloleg.pdfIn PDF document text
    • https://sapuzexa.weebly.com/uploads/1/3/5/3/135348006/goxutagas.pdfIn PDF document text
    • https://jumuwaxenu.weebly.com/uploads/1/3/1/4/131406560/momopisetuzal.pdfIn PDF document text
    • https://xifuvago.weebly.com/uploads/1/3/0/8/130813557/7af255cb4300d.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/5483367.pdfIn PDF document text
    • https://nizifaweneli.weebly.com/uploads/1/3/4/5/134589853/aa86d76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_5e1b7d9a950e454491fd6ad985879be9.pdf?index=trueIn PDF document text
    • http://vawival.rf.gd/9994343661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d674fd-8f64-48a5-9863-a2b395e62f21/lusesiloxosigamaxiwaxod.pdfIn PDF document text
    • http://jejesufunaderuv.rf.gd/finding_missing_angles_worksheet_geometry.pdfIn PDF document text
    • http://bibekuxamawijoz.epizy.com/famous_news_reporters_male.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf504d9-aa9f-4fc7-830e-2f4acccb24f4/math_worksheet_for_grade_5.pdfIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_672074090b2743afb4bd49edd077f8a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b626ef4-04d9-4571-8a51-ab3ef6fdb9dd/how_much_does_pacsun_pay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b24788b2-9f3f-4278-af47-88e9dd375501/los_juegos_del_hambre_sinsajo_parte_2_pelicula_completa_youtube.pdfIn PDF document text
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_17033813770242dabeb14b4a40cac926.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_592dde409ca14e928d55288229e48a09.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d890977-7285-4666-8f0d-0368df1be408/sunbeam_fan_forced_heater_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/510e12d5-03a8-4e3d-8fea-44efeefa2e19/bitoko.pdfIn PDF document text
    • http://nuzetewadan.epizy.com/gumarobez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/752306db-5f7f-4fdb-a990-0b5148fe07a9/rizifela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/addb588e-6f46-4b3b-aa9b-55a0b970db78/tewewukadojofepes.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_off0000ea73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA73 5284 bytes
SHA-256: f6e8d20d25dcbeba789c5d9af36570868bcd489d03f4f8ae63e19e0ac3c52f7a
font_01_sfnt_off0000fc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 10280 bytes
SHA-256: 9471c35003a74ec622700f1821d63d0cb54e70c4230d3a2f613bffe69fc3498c

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