Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff7f4f2e5faf99f…

MALICIOUS

PDF

77.8 KB Created: 2021-06-09 03:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 829e091f2c3e94fd45d85df4d5909bc1 SHA-1: 808d87b9d8e96986608544f331cfa3fcb52b11cb SHA-256: aff7f4f2e5faf99f2ca44fa104c6cd342591031770ef3a3175425b956f3bcd1f
126 Risk Score

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. It contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, indicating a high likelihood of malicious intent.

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
  • 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://smidgel.ru/pbw?utm_term=gizmo+building+pangaea+answer+key
    • https://cdn-cms.f-static.net/uploads/4413228/normal_60228985792bc.pdf
    • https://cdn-cms.f-static.net/uploads/4489428/normal_6013a8d46c694.pdf
    • https://cdn-cms.f-static.net/uploads/4427295/normal_601b3a7f13e41.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://burixiligod.pbworks.com/w/file/fetch/144912381/the_accidental_prime_minister_full_movie_download.pdf
    • http://zafasuvolo.pbworks.com/f/wukukigolo.pdf
    • http://jajafad.pbworks.com/w/file/fetch/144771807/foundations_of_catholic_social_teaching_textbook.pdf
    • http://kejufavo.pbworks.com/f/aurelien_geron_hands-on_machine_learning_with_scikit-learn_and_tensorflow.pdf
    • http://kuperuxowix.pbworks.com/w/file/fetch/144844104/where_is_the_thermal_fuse_on_a_whirlpool_duet.pdf
    • https://uploads.strikinglycdn.com/files/6f4e5676-8b23-4262-9670-7d43558238fd/logical_reasoning_cat_questions.pdf
    • http://lekuzax.pbworks.com/f/penunufamik.pdf
    • https://uploads.strikinglycdn.com/files/c012717b-e03a-41d0-99de-3db7dd78bd6c/labalemumererubujawoxes.pdf
    • https://uploads.strikinglycdn.com/files/730edb8d-ec50-4375-8450-94deab00bd27/rusitevarefev.pdf
    • http://disisopaz.pbworks.com/w/file/fetch/144544095/libro_matematicas_simplificadas_pearson.pdf
    • http://vedufid.pbworks.com/w/file/fetch/144578874/synaptics_ps_2_port_touchpad_driver_windows_7_download.pdf
    • http://saladolu.pbworks.com/w/file/fetch/144589935/fundamentals_of_geometric_dimensioning_and_tolerancing.pdf
    • http://volikedejefa.pbworks.com/w/file/fetch/144615384/prayers_that_move_mountains_john_eckhardt_free.pdf
    • http://leviwim.pbworks.com/w/file/fetch/144909651/tewol.pdf
    • http://kelivesas.pbworks.com/w/file/fetch/144665820/what_were_the_pyramids_used_for_ks2.pdf
    • https://uploads.strikinglycdn.com/files/8fb15808-2c64-4eb8-8b2a-643ea4c55177/how_to_fuse_satanael_persona_5_royal.pdf
    • http://jopamedet.pbworks.com/w/file/fetch/144701142/descargar_net_framework_5_para_windows_7_32_bits.pdf
    • http://zikupuzajix.pbworks.com/f/tikitapow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f220.bin
b9b0dc44a5792c2b5ef325d45befc015c0021cce9102ca07116f28f1dba7d99b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 5756 bytes
font_01_sfnt_off000105c1.bin
dc871d27c24e1583bcc583818dbccf7f20791815d53e70a37b878823a2be5fca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 10700 bytes

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