Malicious PDF — malware analysis report

Static analysis result for SHA-256 77764c32b0876a8b…

MALICIOUS

PDF

76.1 KB Created: 2021-03-14 08:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 23be7601eb412046c0086f59e5cea500 SHA-1: 797246335c9fa7b217ee5609b49247edc7f27e93 SHA-256: 77764c32b0876a8bb674403fac04a5d404a0eb654fbe249c84606120b251fa6f
134 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 ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/strik?utm_term=libro+de+fisica+2+bachillerato+pdf+gratis PDF link annotation
    • http://saudiautoinsurance.com/63644532717mamyd.pdfIn PDF document text
    • http://jadurunus.22web.org/8501054893.pdfIn PDF document text
    • http://heartcenteredequestrian.com/184327461996y1jv.pdfIn PDF document text
    • http://webpost.pro/137063727486wqhv.pdfIn PDF document text
    • http://aycotoro6.xyz/best_book_to_understand_mathematical_logicjtcd7.pdfIn PDF document text
    • https://kaxapanokatonab.weebly.com/uploads/1/3/1/0/131070327/4196357.pdfIn PDF document text
    • https://fitarerak.weebly.com/uploads/1/3/5/3/135313257/8e0b39db.pdfIn PDF document text
    • http://alcexpress3.xyz/957515670677xktj.pdfIn PDF document text
    • http://good-production17.site/321593390118el6e.pdfIn PDF document text
    • http://busibear.com/53332278230epm7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://velirixegu.rf.gd/pumumedesusalop.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/driving_test_questions_and_answers_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a72eac40-aa57-41d9-ac61-e27d77be2af9/best_algorithmic_trading_school.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/happy_birthday_dj_remix_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f42f7523-f718-49fc-a853-6c32796c9973/the_kybalion.pdfIn PDF document text
    • http://babevuzax.epizy.com/51799518555.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/cahier_d_exercices_taxi_1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/088f05d6-3011-44ae-817e-cc218e49cbb7/where_is_the_battery_on_a_honda_eu3000is_generator.pdfIn PDF document text
    • http://mexexumekevuk.rf.gd/lost_stars_keira_knightley_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8facb155-2024-4f17-a0be-7c2463a3154c/xukajimumitekumikep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 2888 bytes
SHA-256: 002800a4821813a929c899fd6bd0ba57a8f832249628ea1c7521c704aaa157d4
font_01_sfnt_off0000e447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE447 5632 bytes
SHA-256: 99bdb24b164162c9114789016ee08737cf86bed4d3228e961f4622ad906b4b9d
font_02_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 13704 bytes
SHA-256: dc8edacdd5f8067b3f3106e71f763b80d35eb27247958261e45e9d9cb2ce8a89

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