Malicious PDF — malware analysis report

Static analysis result for SHA-256 115dcae90ff81f93…

MALICIOUS

PDF

71.4 KB Created: 2021-04-01 07:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bd1e338727440753337d0b7a8803e88 SHA-1: 2b9333afc24d177d6731097d79592fddc341a670 SHA-256: 115dcae90ff81f93f851b2841bfe5d2c6a5bb4d3f0442692aca98c70c63749ec
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are designed to mimic search engine results for common queries, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/award?keyword=british+council+english+grammar+pdf
    • http://tajuliwelofiti.medianewsonline.com/xetoj.pdf
    • http://zhenskiizhurnal.ru/huckleberry_finn_summary_chapter_1-16ny8bd.pdf
    • https://cdn.sqhk.co/bamazaludez/2gdlif7/sonic_2_mod_apk.pdf
    • http://momentikshop.space/74238811819o6o3b.pdf
    • http://danoguvu.medianewsonline.com/pazemawadesuxuwewanepari.pdf
    • https://cdn.sqhk.co/kufalavoxig/yjhiiif/moxafovasa.pdf
    • https://cdn.sqhk.co/lijipatalenu/eNhcgh6/punjabi_radio_online_free_listen.pdf
    • http://ig-socialmedia.xyz/4x4_rubiks_cube_pll_parity_algorithmsm2qri.pdf
    • http://nakanilo.club/316615307711g9bd.pdf
    • http://faponabon.mygamesonline.org/business_plan_template.pdf
    • http://gtomishebs.xyz/how_do_you_reset_a_kenmore_elite_refrigeratoracwp2.pdf
    • https://cdn.sqhk.co/jabisopomuxo/egfAjcV/which_disney_animal_sidekick_are_you_buzzfeed.pdf
    • http://siteznakomstv69.space/net_framework_tutorial_free_downloadwp7y8.pdf
    • http://nafarami.medianewsonline.com/pleomorphic_adenoma_of_submandibular_gland.pdf
    • http://bitcoins-profits.com/57832884541yinsw.pdf
    • https://cdn.sqhk.co/sivefuxonix/5cnqDeV/arcade_machines_for_sale_near_me.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pofijiserige.onlinewebshop.net/47336692742.pdf
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_0d7a5bd746ec446f84847e801cacf812.pdf?index=true
    • https://55afd15b-9a96-48ff-beb6-d705f4765584.filesusr.com/ugd/8b06a9_9280cc07283a47bf931690efdde48aa7.pdf?index=true
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_bdeb129ac2a248cc9b1820601e6bc029.pdf?index=true
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_5a6dddd1402246848f498508da8832f1.pdf?index=true
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_412d1e4ce17d4f9abb6bfa662217c6aa.pdf?index=true
    • 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_off0000da68.bin
754e43eac62af1c2a5c1afc84e6b339a7435a5335aac252753125f8941d700a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 5616 bytes
font_01_sfnt_off0000ed58.bin
ed480c684217528d5b982e2151959e41387e3420a601f2f4ff3c187ef489ff8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 10200 bytes

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