Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad6ac89dcced9cc…

MALICIOUS

PDF

78.3 KB Created: 2021-03-25 13:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f26f36821506cc1b33e0fc32998090ca SHA-1: 28c0a2ecebb5e8cc6849d1979a700d53c1bd3338 SHA-256: dad6ac89dcced9cc12fdca58bb62d2686c5734182cb77d1254e555dc7ea6f604
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to unknown or potentially malicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URI heuristics suggest it's designed to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/award?keyword=pasos+spanish+beginners+course+book+pdf
    • https://tijabitosivu.weebly.com/uploads/1/3/4/3/134396728/704a631e.pdf
    • https://sorawujij.weebly.com/uploads/1/3/4/6/134671526/1643581.pdf
    • http://openlait.pro/how_much_systems_engineer_earn_in_ukygyw7.pdf
    • https://cdn-cms.f-static.net/uploads/4403804/normal_60170de39758a.pdf
    • http://cashbackmoney.info/premiere_pro_equivalent_free9qe8j.pdf
    • https://cdn.sqhk.co/nemazuwigumo/lxjiice/kung_fu_panda_warrior_selection.pdf
    • https://xetamoro.weebly.com/uploads/1/3/2/8/132815737/vixefimufos-fefowi-lakuralan-ridifu.pdf
    • https://cdn-cms.f-static.net/uploads/4416653/normal_60540d612eac1.pdf
    • https://rogifegupoxixo.weebly.com/uploads/1/3/4/0/134040774/7bf59db60.pdf
    • https://static.s123-cdn-static.com/uploads/4496225/normal_5fd02f1878fdb.pdf
    • https://cdn.sqhk.co/taxodisilif/ii4jeYp/rebel_racing_mod_apk_uptodown.pdf
    • https://cdn.sqhk.co/xibetevoxaj/b0SnCgc/best_free_parental_control_app_for_iphone_uk.pdf
    • https://cdn.sqhk.co/bilanogakiw/vGPjhgf/fall_guys_ultimate_knockout_gameplay_pc.pdf
    • https://static.s123-cdn-static.com/uploads/4383582/normal_5ff660ee5845b.pdf
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/8c315.pdf
    • https://cdn-cms.f-static.net/uploads/4370078/normal_6046906dc106a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/44a85cad-cfcf-4b12-9125-794e2ccfae28/can_you_do_a_living_trust_without_a_lawyer.pdf
    • https://uploads.strikinglycdn.com/files/52c954a9-78d6-4dac-a760-363333345f97/58644381830.pdf
    • https://s3.amazonaws.com/juzewojavomofew/sample_performance_appraisal_comments_by_managers.pdf
    • https://uploads.strikinglycdn.com/files/4f9a0a7f-120d-4a15-accd-0d3a97cf1478/vitoxanuvasejazudaset.pdf
    • https://uploads.strikinglycdn.com/files/3665ed5b-9e65-4df5-9150-87ef3fdec362/oil_gas_ratio_mercury_2_stroke_outboard_motor.pdf
    • https://uploads.strikinglycdn.com/files/ad8792a1-6674-43a9-9d2e-10bf9326a7f9/cuisinart_dcc_3000_12-cup_on-demand.pdf
    • https://s3.amazonaws.com/xopugup/llama_llama_red_pajama_guided_reading_level.pdf
    • https://s3.amazonaws.com/nelizenejakarug/58049926402.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_off0000f380.bin
a8819f216b4bcaa9f17c9d2e699a0f3cad2f50653a9b8e54c7ac72fd61945704		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 5588 bytes
font_01_sfnt_off00010677.bin
39cfe23aba9a7a108857add7b61e4fe4d2765d71383abd83cbab043a49ebaa60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 10844 bytes

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