Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48066f476518e84…

MALICIOUS

PDF

75.4 KB Created: 2021-03-28 00:22:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc9e3c37e32714b58545de1a951e9a6b SHA-1: e37007ce5447246c455d91a64ba28a7178544550 SHA-256: a48066f476518e8424e5ff10b408f318d371ad6a95739f8aa77e1a8a0df792b4
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with the primary heuristic indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/wix?keyword=the+day+after+tomorrow+worksheet+esl
    • http://help-violation.com/30137923827nr2aq.pdf
    • http://contentmedialiteracy.com/nolekazurfwq5.pdf
    • https://cdn.sqhk.co/vuwewiwudesi/ijjSjha/67092117413.pdf
    • http://lavkavkusa.store/cowpens_weather_reportidng9.pdf
    • https://wusoditada.weebly.com/uploads/1/3/1/4/131406121/zilagadozojagip-zijejewaz.pdf
    • https://cdn.sqhk.co/vebapejun/jDPjcgg/jajavifevawukalasawavupu.pdf
    • https://cdn.sqhk.co/gitesafuwu/gggdHjd/elementor_product_page_template.pdf
    • http://airned.ru/what_was_the_main_causes_of_the_american_revolutionmrkdp.pdf
    • https://fixefukazadutux.weebly.com/uploads/1/3/1/6/131607703/xegudesopovi_xonizik_rebumaluv.pdf
    • http://startbastar.online/nook_model_bntv600_charger5cgwj.pdf
    • http://koolmaxt.online/pigudonabd7kb.pdf
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/votukogovolu_webowoteforop.pdf
    • https://cdn.sqhk.co/ladesajisama/jjjdjgQ/78042011249.pdf
    • http://vsspb.ru/69635634333sppej.pdf
    • http://fresh-ita.fun/what_does_it_mean_when_a_horse_is_fancy_brokec3e4i.pdf
    • http://generatorsale.ru/63312053750nysd1.pdf
    • https://cdn.sqhk.co/budufunewuf/Ljegjid/pupikuxevotupibodufog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b164e17e-46d9-4dda-8baa-2edf469a4683/joveveligokatabofi.pdf
    • https://uploads.strikinglycdn.com/files/151d0139-5280-4df3-aef7-18150275560e/excel_2010_advanced_formulas_and_functions.pdf
    • https://uploads.strikinglycdn.com/files/ce60cf4a-31c4-46c6-898f-66793b971486/anime_characters_stronger_than_one_punch_man.pdf
    • https://uploads.strikinglycdn.com/files/e963a508-ec30-43dd-9a30-f9cbb5a722dc/fisipopiraz.pdf
    • https://uploads.strikinglycdn.com/files/4b25d5ff-62c0-4d2f-adcc-5e6cbae78747/is_mcdonalds_sausage_keto.pdf
    • https://uploads.strikinglycdn.com/files/c4e5575f-1842-46a4-912b-74cf95419239/34701715013.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_off0000e80b.bin
bdd374f5c557f88e565d145dd7cad7586f50cd32c64ad3b1bdb0547f1beb5d79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE80B 5352 bytes
font_01_sfnt_off0000fa2d.bin
ed6b8bf7148571608d07017da0b89abe02db392dd21281e1d67393a72159e3e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2D 11128 bytes

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