Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb244b41f461b30…

MALICIOUS

PDF

72.2 KB Created: 2021-01-18 00:18:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 843cb00982335a6809f1333915212a1d SHA-1: d7d860d64a5956abaad3e79d7af69be4547c2b1a SHA-256: 1cb244b41f461b3079d72dbe9d1d4d1f5b9a534aeed9f627e5c7df8b2eaba46a
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or scam attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure to download further malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=dover+marching+tornadoes In PDF document text
    • https://site-1239165.mozfiles.com/files/1239165/coldplay_yellow_piano_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/jPjIQja/demon_king_romance_books.pdfIn PDF document text
    • https://site-1171150.mozfiles.com/files/1171150/kusunemovunajorigoxewefap.pdfIn PDF document text
    • https://site-1244981.mozfiles.com/files/1244981/beretta_92x_performance_specs.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/ijge6dh/15162596721.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/giOrM9C/xekerazizubofebikivo.pdfIn PDF document text
    • https://site-1174461.mozfiles.com/files/1174461/1608454660.pdfIn PDF document text
    • https://site-1257724.mozfiles.com/files/1257724/analytical_skills_test.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/eggPhiJ/zepef.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/n7sYTja/final_countdown_app_widget.pdfIn PDF document text
    • https://site-1168018.mozfiles.com/files/1168018/off_the_rails_3d_levels.pdfIn PDF document text
    • https://cdn.sqhk.co/nepasibuta/tje14pk/konasunebefewudunowib.pdfIn PDF document text
    • https://site-1177566.mozfiles.com/files/1177566/old_vegas_slot_machines.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/jihbgcV/emergency_contact_template_for_babysitter.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/fajeloninesitel/1827809819.pdfIn PDF document text
    • http://jenesigafepi.epizy.com/pebabenarowikipobatot.pdfIn PDF document text
    • http://kokiralasido.epizy.com/floor_joist_span_guide.pdfIn PDF document text
    • http://xenuduximowub.epizy.com/e_commerce_branding_strategies.pdfIn PDF document text
    • http://sojisij.epizy.com/vebaretawakan.pdfIn PDF document text
    • http://gikunipif.epizy.com/mansfield_park_movie_parents_guide.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_off0000ded5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED5 5380 bytes
SHA-256: 9cf3b6ca3dbefe4e6558e31d7253b1d8cc4b44aef5479aee945d28464e047327
font_01_sfnt_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 10064 bytes
SHA-256: 9b358e51b490270fd595d8735c8318620b71bea1e60d70f284b99b2b217c33f1

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