Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f68f1a7a26f876…

MALICIOUS

PDF

75.0 KB Created: 2021-03-20 09:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ee3ac5663ecbc62b96923f204ecc96f9 SHA-1: 9bb9d8e14ed36e44c212f88afe840d3ae7699b29 SHA-256: a3f68f1a7a26f876ae37bb932b91c139572691b27ebbfeeb241582beb7647393
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://kuzutuzo.ru/wix?keyword=ninja+foodi+deluxe+manual PDF link annotation
    • https://cdn.sqhk.co/bepoweruga/b3y5Pia/nizopenobafuxavozenefapop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426822/normal_600e34a4914f5.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/past_tense_vs_present_perfect_tense.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/i2biegg/double_dragon_trilogy_pc_download.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/89332482556.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/where_does_the_water_pan_go_in_a_smoker.pdfIn PDF document text
    • https://cdn.sqhk.co/zutomina/ji8dijl/24175205445.pdfIn PDF document text
    • https://cdn.sqhk.co/dezosanag/hc0SigU/can_you_mix_two_colors_to_make_blue.pdfIn PDF document text
    • https://cdn.sqhk.co/xunixenovapi/iel2ijZ/sakura_school_simulator_versi_lama_0._96_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/hjxGria/crossword_puzzles_free_online.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/69161178734.pdfIn PDF document text
    • https://cdn.sqhk.co/tititafoza/hbifp3d/parental_consent_letter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367632/normal_604cd66b18d3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490272/normal_5ffb67f2058b0.pdfIn PDF document text
    • http://lenugaguv.medianewsonline.com/ego_power_56_volt_cordless_lawn_mower_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/gnjfJQQ/battle_of_vicksburg_3_apk_3._11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444626/normal_5fcb5edab5157.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/b215da7f-1262-4264-af12-9d59c23a19e0/xedulemoxufarix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c88a97e-3503-49f7-ad4e-065061084940/derek_prince_sermons_holy_spirit.pdfIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_ebf2cec77a5a491889abeab3dd7493fc.pdf?index=trueIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_b1bfec3b07b3427aad61abe228c816e1.pdf?index=trueIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_8c45f6f62c3f4d72abc46f79322b0348.pdf?index=trueIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_fc4a3392aa3447ec8eea7e1e41176b59.pdf?index=trueIn 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_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 4892 bytes
SHA-256: f13f8f4b263f88423c7b741fbf58989c6db83816e5a98c4bf297b147b3469683
font_01_sfnt_off0000f5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 12136 bytes
SHA-256: e345c9bd8f045c89d12d493ff86c858e3a73126d74a11c0d24dfea42304bbd46