Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b0bd621d208060…

MALICIOUS

PDF

100.6 KB Created: 2021-04-02 22:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cf9a1fa7377f81ed33b7651f219ca549 SHA-1: 23e61b764cd0fbda83a2884c0939acff7c8a2963 SHA-256: 43b0bd621d20806001a7e826a0092626da8e543bab6dc076f1ae8ba07fb1f80d
192 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and phishing attempts, including links to known malicious redirectors and a link farm on disposable hosting. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a download button lure and the overall structure suggest the document is designed to trick users into visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/wix?keyword=amoeba+sisters+enzymes+answer+key In PDF document text
    • http://ridunculus.com/the_blind_side_true_story_real_familyr3yh4.pdfIn PDF document text
    • http://latuha.com/97556662767n0v1t.pdfIn PDF document text
    • http://stixlife.info/90096765691s0tzm.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/how_to_upgrade_sky_q_box_to_hdrv0s6z.pdfIn PDF document text
    • http://kanshoper.site/44578508853ozp5f.pdfIn PDF document text
    • http://krokoboko6.xyz/phoenix_os_android_tv_boxtua7r.pdfIn PDF document text
    • http://winclean-shop.space/jugopubomua9vl3.pdfIn PDF document text
    • http://topijakalez.22web.org/tagoj.pdfIn PDF document text
    • http://yeswins.space/comptine_d_un_autre_ete_sheetkwn7z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giverez.epizy.com/python_programming_tutorial_for_beginners_with_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbbca85b-7960-4cf9-83c1-959ab412bd0d/70438371120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b8b7d2-13a7-4d28-8183-c2796c9ae36e/91458807428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb4ea8f6-120b-45df-ace4-754c7f19061d/how_to_improve_your_social_skills_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb39ef28-7493-41d5-8e8c-040afcf7723b/92808824839.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/brothers_movie_filmywap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a84c416-3234-4a82-80e9-0603cb354cf2/schaums_outline_of_french_grammar_7e_crocker.pdfIn PDF document text
    • http://surafupomef.epizy.com/la_crosse_bc-700_technoline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a348b2-970c-4e2f-b98f-c640591c52c7/how_to_make_small_tissue_paper_flowers_step_by_step.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/archbishop_high_school_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/how_do_i_reset_my_ac_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/602e2c22-9093-4b09-9490-31267a840cdf/how_to_adjust_rollerblade_adjustable_skates.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/will_usps_check_my_package.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/tipos_de_sensores_y_actuadores.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_off00014dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DAC 5236 bytes
SHA-256: 256c910bbb4db515f969f767bb2b86d37670355f26a7928722689d57a1d9a9c8
font_01_sfnt_off00015f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F81 10944 bytes
SHA-256: 9eed5d77ffb3068e0aeec5daadb771621da7ce404845fb9dcc7344e1b76cda5f