Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f89f4484e30030d…

MALICIOUS

PDF

68.4 KB Created: 2021-02-27 05:34:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f21f949da6b807816a3e9bbd21f4696c SHA-1: 45ba8c9b2e3abf192fa74821806e5b42dd5c23e4 SHA-256: 1f89f4484e30030d32903d958eff0c0d35229892e31ac6ee5f547b584b6b8cae
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of an SEO link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a high likelihood of phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious verdict. No scripts were extracted, but the embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/strik?utm_term=tung+group+theory+in+physics+pdf PDF link annotation
    • https://cdn.sqhk.co/dolafita/VunjcKo/steam_gift_card_codes_for_sale.pdfIn PDF document text
    • http://aycotoro6.xyz/sowinatofalumamizil9oyn.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/gh9RhjQ/modern_on_the_rails_mamaroneck_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/desavusomo/uibteVJ/like_a_boss_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/gihiiMd/annotate_app_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/njhidhe/crazy_taxi_apk_download_uptodown.pdfIn PDF document text
    • https://jokasagumejede.weebly.com/uploads/1/3/1/0/131070006/2057838.pdfIn PDF document text
    • https://litokotivugobud.weebly.com/uploads/1/3/2/6/132695550/jufeduzuli_gubozupup_wekekegubar_rumoxen.pdfIn PDF document text
    • https://lexawuvake.weebly.com/uploads/1/3/4/6/134610488/2922040.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/Wjejam3/elementalist_fractal_build_gw2.pdfIn PDF document text
    • https://gununoneku.weebly.com/uploads/1/3/4/3/134309052/49cad0b.pdfIn PDF document text
    • https://cdn.sqhk.co/lagitesavap/21wgdge/59838630737.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/yhdESfs/smart_load_wallet_sub_dealer.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/dobikasukavu/8th_grade_math_systems_of_equations_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/exception_handling_in_c_ppt.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6E 5224 bytes
SHA-256: e97a866166df9297db3c478e0c960415c2e407bf9b6dd62021c634fce4671200
font_01_sfnt_off0000e145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE145 10480 bytes
SHA-256: 322d1aa015a99fbe638856d758c28fe57fc52a79d1dbc6ede0f383ed2c0993b1

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