Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d55cd9e7ba8e29b…

MALICIOUS

PDF

88.8 KB Created: 2021-03-25 03:42:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fe40c6106fffa7c4e6a7c55d76ed376 SHA-1: 7c56daeedf4f005a9eb59b686032eee529b56428 SHA-256: 9d55cd9e7ba8e29b80ac61039023aa1094bd27b1c8be1b14116bbe88fbb2717e
156 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, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest the intent is to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://bologen.ru/wix?keyword=dark+souls+shields+3
    • https://cdn.sqhk.co/mixasuwekov/jhlsN2C/13300493271.pdf
    • https://cdn.sqhk.co/baxikomo/CrezNgf/gangster_squad_origins_mod_apk_download.pdf
    • https://cdn.sqhk.co/nowovadizeb/ifhcdhh/wives_love_your_husband_bible_verse.pdf
    • http://durofuvixari.22web.org/kyocera_fs-1135mfp_toner_wechseln.pdf
    • https://mukeremu.weebly.com/uploads/1/3/4/3/134316251/lanekizivetat.pdf
    • https://gomafaned.weebly.com/uploads/1/3/5/2/135296522/4858595.pdf
    • https://cdn.sqhk.co/faserekino/RhhCHgj/deserted_island_survival_minecraft.pdf
    • http://rerazato.22web.org/wepogadesenodamuleboka.pdf
    • https://cdn.sqhk.co/zirixegip/iighdH0/lobifavijiwefejarupadeza.pdf
    • https://dopijixofovaje.weebly.com/uploads/1/3/4/6/134692352/6670827.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kudowo/cartoon_network_app_android_apk.pdf
    • https://uploads.strikinglycdn.com/files/92fb1ee3-b6c0-481a-af3c-70162edf6a16/50872102830.pdf
    • https://uploads.strikinglycdn.com/files/8a387a97-6469-4c00-be94-f2557e8599e0/taremazu.pdf
    • http://ragupufonipona.epizy.com/87353094908.pdf
    • https://s3.amazonaws.com/vavebufevodutob/38198547472.pdf
    • https://uploads.strikinglycdn.com/files/16b1ff42-4beb-4e9f-8f47-428ff589c546/ditozikubak.pdf
    • https://uploads.strikinglycdn.com/files/0b5c265f-c248-469c-b22b-b78aaaac968e/stihl_fs_130_spare_parts_list.pdf
    • https://s3.amazonaws.com/diwitapezu/bhojpuri_movie_2018_hdvd9.pdf
    • http://sonisan.epizy.com/32360815403.pdf
    • http://duvexarido.epizy.com/outwood_bydales_uniform.pdf
    • https://s3.amazonaws.com/pusori/admiravel_mundo_novo_ebook.pdf
    • http://xunurevi.rf.gd/nursing_care_plan_for_anorexia.pdf
    • https://uploads.strikinglycdn.com/files/d676e1b9-0b04-4acd-82e3-30722627fec6/windows_10_power_plan_usb_settings_missing.pdf
    • http://memavopunon.rf.gd/dunkin_donuts_nutrition_information_turkey_sausage_breakfast_sandwich.pdf
    • http://ronunof.epizy.com/the_family_crucible_audio.pdf
    • https://s3.amazonaws.com/nilafafakem/when_was_the_remington_model_11_made.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_off00011bd7.bin
57b0bbc2799ad4a65ec7de8d33ce9db734310a897f602eeae8c1bd2485e68c50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD7 5140 bytes
font_01_sfnt_off00012d53.bin
0c81bd1114340e38652e75083e6edac2489128722b1ba3ba0d07cc63855663a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D53 11788 bytes

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