Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab131131ec37d850…

MALICIOUS

PDF

80.4 KB Created: 2021-04-21 17:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a6fe6724f2385581076725055881a73f SHA-1: 207318d58b2fe60108ed91ce9b6e674de167d841 SHA-256: ab131131ec37d850760e30da4fee3e9ac7fa08c8083bdad84a28db9c0f9daa3a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to SEO-optimized PDF files, suggesting a link farm or phishing lure. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK indicate a deliberate attempt to redirect users to potentially malicious sites like https://jottigo.ru/strik?utm_term=what+is+a+pivotal+point. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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=what+is+a+pivotal+point PDF link annotation
    • http://foxilajat.sportsontheweb.net/vampire_diaries_season_3_episode_1_soundtrack.pdfIn PDF document text
    • http://giwitap.getenjoyment.net/zolakeruzofesidikivele.pdfIn PDF document text
    • https://visofamawuri.weebly.com/uploads/1/3/2/3/132303269/1825738.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/825065.pdfIn PDF document text
    • https://cdn.sqhk.co/tamenotu/hjfihd5/what_is_the_christianity_symbol_mean.pdfIn PDF document text
    • https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/zipizitutizoxelo.pdfIn PDF document text
    • https://lojavexir.weebly.com/uploads/1/3/5/9/135963097/talulikuvagoza_nusuzogajejaka_mibajo.pdfIn PDF document text
    • http://depusapo.mypressonline.com/best_anatomy_books_for_physiotherapy_students.pdfIn PDF document text
    • https://cdn.sqhk.co/lovojekaboxi/FLjddgd/wubozugexezajepojokeser.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/cambridge_advanced_learner_s_dictionary.pdfIn PDF document text
    • https://fafafupoxojamu.weebly.com/uploads/1/3/5/3/135350358/7a9008b8112.pdfIn PDF document text
    • http://bowuvudofi.scienceontheweb.net/call_of_cthulhu_7th_edition_investigator_s_handbook_free.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/naxozelozude/sherlock_holmes_rachana_samagra_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/13057455338.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/69699042250.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/3d_shapes_and_nets_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/netgear_wn_2000_rpt_v3.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/how_to_wear_a_face_mask_properly_cdc.pdfIn PDF document text
    • http://pudolajuji.atwebpages.com/59174050821.pdfIn PDF document text
    • http://rixibedi.onlinewebshop.net/psychological_personality_disorders.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_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 4884 bytes
SHA-256: 44ce06bfaf8ad00bfd1baf3c19ab74fc456a6d01d146cb3025ff2a99874da0b1
font_01_sfnt_off00010cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF1 11240 bytes
SHA-256: 07eee9acb7ec72c329534983a3f625b7ad0a0e9ef404274484a2b6f949568d1d

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