Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f7fe9d8d846367…

MALICIOUS

PDF

89.2 KB Created: 2021-04-07 22:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 81633bb9912438b6786b4c648e0bbdb1 SHA-1: bcd198a4b9285525a60d1dc0f940aaa5ae9184c5 SHA-256: e6f7fe9d8d84636740f155fc912ff75cc63f217610611087d6d507cbf27f2a84
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or potentially malicious domains, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a legitimate document, such as a worksheet, to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://baarspo.ru/wix?keyword=16.2+climate+change+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/nukusigemug/gqghD4D/remitly_envio_de_dinero_a_mexico.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/Ajhiejb/44987131731.pdfIn PDF document text
    • https://cdn.sqhk.co/denalivek/hjhVHjW/download_aplikasi_demolition_derby_3_mod_apk.pdfIn PDF document text
    • http://hangookoil.ru/free_download_sharepoint_tutorial_for_beginnerst7nre.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/gclT3jd/danujonosifakoxitel.pdfIn PDF document text
    • https://cdn.sqhk.co/bukoxomule/dhbTvgg/ufo_arena_2_deck.pdfIn PDF document text
    • http://znakomstva18x.site/craftsman_tool_set_cmmt992061mksa.pdfIn PDF document text
    • http://japancar-sib.ru/main_difference_between_specific_deterrence_and_general_deterrenceq32ln.pdfIn PDF document text
    • http://smeshnoykir.space/tufepufeduxem3qrtk.pdfIn PDF document text
    • http://topcreditscore.info/kufipiget62xgl.pdfIn PDF document text
    • http://greatholl.com/point_guard_workoutwa35c.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/iZjfiio/82207092883.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/permanent_record_edward_snowden_downloadodh6q.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/hcjcgNF/fidget_spinner_canada_cheap.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/gdf0ifx/95561924035.pdfIn PDF document text
    • http://whitetwo.space/21036560681dwt2n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c95b8bf-3358-4981-a2c7-63eb49408c98/79273824070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e102d9ba-6d60-44b6-a3ed-182260fb532c/rupaladizuzomelofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/605587b0-0aa3-442a-9c60-69e9985a450a/putus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e76406ae-6478-4249-9404-6819e76a85ad/57719540582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b54dc9-d8e0-4d9b-a1e5-dc3538f6f7da/jinetojidubarebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53531f22-0b1e-4f8b-b912-7c19fa741e1c/walt_whitman_love_poems_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edca27cc-0c36-400a-9fe3-f240057dc99b/43666476320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fca436c-7f1c-4fd6-b532-56d5c4cf1cee/life_fitness_elliptical_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae771e6-e41c-4dd1-a167-d2d7f3968480/sennheiser_ew_100_g4-me2-g.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/138e45ac-a0b3-4943-9aa9-aa077fa82cf0/56151641622.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 6440 bytes
SHA-256: edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75
font_01_sfnt_off00011a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0F 5644 bytes
SHA-256: bf2380282b38b1f2a9cda4b9ac05f4b30d175a77ba5e6fc8300e106b0e3a52ab
font_02_sfnt_off00012d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D33 12184 bytes
SHA-256: 5c31dff795f47617690e90356a6824aaec93199e0a417df4de0ef298370e7e8a

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