Malicious PDF — malware analysis report

Static analysis result for SHA-256 2407e24f0e73b37a…

MALICIOUS

PDF

81.1 KB Created: 2021-03-14 02:18:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6dad69aab85a8ab346babc08a41f02f1 SHA-1: 561de301c98f694a56a1a84d998bdec5094148e3 SHA-256: 2407e24f0e73b37aec3868a83c6e0ad4966ce5f143ed1abd2d7a8469b667df64
186 Risk Score

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 0.9993

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://gimoguvi.ru/award?keyword=campus+interview+aptitude+questions+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/lamidipeke/YuEhjjh/59088443780.pdfIn PDF document text
    • https://turakenedonatup.weebly.com/uploads/1/3/4/6/134610331/2f75165dabf1.pdfIn PDF document text
    • https://jotesufuxave.weebly.com/uploads/1/3/1/4/131483421/2d8b937ba2.pdfIn PDF document text
    • https://sidilatadafexu.weebly.com/uploads/1/3/1/1/131164021/f25422c15.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvitatutuv/hii2uhi/tifix.pdfIn PDF document text
    • https://kevanosum.weebly.com/uploads/1/3/0/9/130968994/boduvanineliguf-jazofegid-gijavinuwom-zawalavasa.pdfIn PDF document text
    • http://vemasujananexu.22web.org/xunibajitakewofefubeji.pdfIn PDF document text
    • https://kixuvatapowow.weebly.com/uploads/1/3/1/3/131383305/8881499.pdfIn PDF document text
    • http://lusejifunod.22web.org/bacillus_licheniformis_in_agriculture.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/sejir.pdfIn PDF document text
    • https://cdn.sqhk.co/vatukaso/ajaiacz/events_this_weekend_in_lansing_michigan.pdfIn PDF document text
    • https://waguxezemi.weebly.com/uploads/1/3/4/7/134703223/xigimavi.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/sixenogafopoj/christmas_songs_backing_tracks_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/bypass_frp_samsung_android_5_apk.pdfIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_0ec5893afa2649ecbc2d3c1e9b15e41f.pdf?index=trueIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_4b1224efe34e4d468e6089da4d983859.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/xafasobaxijidenu.pdfIn PDF document text
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_42e26c9708984d649f189abebcb7bff0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovilowab/96928952344.pdfIn PDF document text
    • http://tajisogekumobuk.epizy.com/lipid_digestion_and_absorption.pdfIn PDF document text
    • http://wusojodidol.rf.gd/american_history_textbook_college.pdfIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_0b9a69ffbb7e4543926c521c76ecba66.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/51086197140.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_07589330b2df4966be48ddab0b33a314.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_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 5336 bytes
SHA-256: 765617487e5566a7aab42436f09f0790dbd4e28cb6bdfefdd498e0c189941b20
font_01_sfnt_off0001142e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142E 10544 bytes
SHA-256: adff086dd42d589432d719b8f11ffc12f81e65a83df53cfc108894fcd513723e