Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7fdc419f52f441…

MALICIOUS

PDF

101.6 KB Created: 2021-03-10 22:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9e2f0af51232029cba5617ab992acf06 SHA-1: c9d4d91f1e818d46a9b0829bbba138cee401feb5 SHA-256: 5f7fdc419f52f441bdc39baa566ddcab00ada92d6857b721baf537012a9b3826
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains a URL that appears to be part of a lure related to 'macbook pro for computer science student'. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 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://baarspo.ru/strik?utm_term=macbook+pro+for+computer+science+student PDF link annotation
    • https://cdn.sqhk.co/xodakebebit/3jghjp2/phoenix_arizona_time_zone_map.pdfIn PDF document text
    • https://cdn.sqhk.co/vekasurox/hiVvjhP/paint_blast_escape_room.pdfIn PDF document text
    • https://julupoberoraw.weebly.com/uploads/1/3/4/3/134353221/nabev.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/JhaUgti/wegisap.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/ggeClgc/calendar_september_2020_printable_colorful.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/igdgXjj/music_player_online_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/cfhbN3m/forest_bubble_shooter_review.pdfIn PDF document text
    • https://posuzelivoj.weebly.com/uploads/1/3/4/8/134869480/827c057ce4331f.pdfIn PDF document text
    • https://cdn.sqhk.co/bizewavaxug/FQnxhir/avatar_full_movie_for_free.pdfIn PDF document text
    • http://ninozefumuwu.iblogger.org/96209305167.pdfIn PDF document text
    • https://vinofuloro.weebly.com/uploads/1/3/4/8/134850824/lujadebezovet-firitaki.pdfIn PDF document text
    • https://nipixejewawowe.weebly.com/uploads/1/3/0/8/130874539/5761786.pdfIn PDF document text
    • https://fakokawiloduku.weebly.com/uploads/1/3/0/7/130775735/dupubiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a199a46-2fc5-45bc-a52d-d7ae9473ce15/how_to_study_linux_administration.pdfIn PDF document text
    • http://laganomezavarof.epizy.com/adding_decimals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/795ec13d-9a7e-472d-b335-7e1b5c751507/dewalt_dw733_planer_knives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9f43ea9-80f8-4999-a52e-a5b5d730ae49/accu_chek_performa_nano_manual_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31141722-e557-4b26-aebb-3a412bf85cc2/scrum_methodology_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3e98a9a-2571-4bb1-896d-09b8118c7795/myles_munroe_teachings_on_the_kingdom_of_god.pdfIn PDF document text
    • http://tofetakipumax.rf.gd/the_other_side_of_paradise_glass_animals_lyrics.pdfIn PDF document text
    • http://xuzujokavagud.epizy.com/formacion_argentina_francia_mundial_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a912b8-db76-4259-9d01-c8a5e2e63757/fomijogezalezu.pdfIn PDF document text
    • http://mirimanomuropa.rf.gd/pigidobomunaxelene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0733993e-69bf-45c4-9832-6a1e144037de/35619141526.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_off0001451d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451D 3008 bytes
SHA-256: 9c3aa37f880fa77b1b1be53721957574f6c7a3649b70614fb83142819fc47120
font_01_sfnt_off00014fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE7 5480 bytes
SHA-256: c0a24fb7cb546005190273cf02fb31b3f159c6692d057c1b4d8fd6b418045fdc
font_02_sfnt_off0001627b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1627B 11204 bytes
SHA-256: 8d672a918d52e2b904e5355e3af4e023c42be2f35fa0c1cddf0c746be6c7af8e

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