Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6f057ef1b4dbb9…

MALICIOUS

PDF

74.6 KB Created: 2021-02-22 18:03:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e21249137bb6ef1e4a8ac88b709a93ef SHA-1: a038eb9bc9910ee5ea901e1787ed04d4e990b1bd SHA-256: 4c6f057ef1b4dbb9ef2a7534d5da470b38a70105f9eca46894b2e7b68f1bc312
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to S3 buckets and Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text related to 'dynamic dna webquest answer key', indicating a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=dynamic+dna+webquest+answer+key PDF link annotation
    • https://wopinifem.weebly.com/uploads/1/3/4/8/134884590/tudodumanadupi.pdfIn PDF document text
    • https://zakutawevuvukug.weebly.com/uploads/1/3/5/9/135970657/5405371.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/ijjjiga/like_a_boss_lonely_island_video.pdfIn PDF document text
    • https://cdn.sqhk.co/woxiwovar/hangdFw/50626643718.pdfIn PDF document text
    • https://fexasesari.weebly.com/uploads/1/3/1/0/131070539/5266d893649443.pdfIn PDF document text
    • https://cdn.sqhk.co/texonatuzi/bbhgggH/whip_sound_app_from_big_bang_theory.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/icnC3jh/verizon_my_numbers.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/UzjaIjG/iot_projects_using_arduino_uno.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/nowagimopuf.pdfIn PDF document text
    • https://cdn.sqhk.co/kugorazig/jhjcfDw/art_wallpaper_full_screen.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/hahdMif/average_cost_to_build_a_house_in_texas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/android_10_para_s8.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/plaque_of_ergastines_context.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/xofis.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/34497066979.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/16512516980.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/2870988912.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/78181541240.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_off0000e5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FE 5576 bytes
SHA-256: 88c9d9739fb9a1127717d48c2b0f50887c7fdd969b786603ff7975daa31ba474
font_01_sfnt_off0000f8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F7 10504 bytes
SHA-256: 0d6fe8cda28912ffaa1dc9f1e1bef37885ef5b71eb9e1028f0cc91e929d8b808

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