Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c7f05142ac561e…

MALICIOUS

PDF

81.8 KB Created: 2021-03-23 01:10:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b86613e4f4faf34c038e453e65889da SHA-1: 99caca2494112013ed6fe7dcc62db3b1618bf2ac SHA-256: 35c7f05142ac561e7f30df9766fbb226f7748422e585a14702e2acb12307ff69
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including one that appears to be a search result for 'wickr me apk android 4'. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, and ClamAV detected the file as Pdf.Phishing.Trojan. This suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/wix?keyword=wickr+me+apk+android+4
    • https://kagidawizukafep.weebly.com/uploads/1/3/5/3/135346662/zonokegila_nakiki.pdf
    • https://cdn.sqhk.co/xotalawad/Ojbgdha/classical_trumpet_solo_sheet_music_free.pdf
    • https://cdn.sqhk.co/kepilujofeje/ibABzZu/umc_hospital_new_orleans.pdf
    • https://cdn.sqhk.co/badiboxa/fRichja/digestive_system_function_chart.pdf
    • https://cdn.sqhk.co/tixelila/ghhgkwF/samsung_video_player_download_apk.pdf
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/jubagux-jiwoveroroba.pdf
    • https://cdn.sqhk.co/xaselavub/igtibSe/xilusixida.pdf
    • https://fafapiponuge.weebly.com/uploads/1/3/4/6/134692005/girefapodapexedovur.pdf
    • https://cdn.sqhk.co/luwesefizi/biS3Shi/zubokenafugegugomof.pdf
    • https://cdn.sqhk.co/gojinuma/s1ifijJ/fofobiwaxutike.pdf
    • https://gowumobajakexe.weebly.com/uploads/1/3/4/5/134585768/8583612.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dd70aa9d-092c-426e-a6ee-8765df4b6aae/wild_magic_tamora_pierce_wiki.pdf
    • https://uploads.strikinglycdn.com/files/df23ea2a-d082-4c46-ac8b-0ca2c0cecbdb/kenmore_elite_microwave_manual.pdf
    • https://uploads.strikinglycdn.com/files/f3498317-bcdc-483d-946f-7c37e2ef994d/95663200778.pdf
    • https://uploads.strikinglycdn.com/files/87c4c615-a148-493a-8cbe-992a7b86a0a4/who_is_the_wanderer_in_vikings_supposed_to_be.pdf
    • https://uploads.strikinglycdn.com/files/5aaba543-a784-4d33-90bf-4686cca692a7/58789451249.pdf
    • https://uploads.strikinglycdn.com/files/789999af-0b19-4801-9ef2-5e79e2906ca1/shakespeare_poems_sonnet_139.pdf
    • https://uploads.strikinglycdn.com/files/dea1e8c3-de19-452e-8109-52d55be3983b/charla_de_seguridad_novedosas.pdf
    • https://uploads.strikinglycdn.com/files/00367a56-9555-4a2c-9310-833440214a07/que_es_un_manual_de_organizacin_empresarial.pdf
    • https://uploads.strikinglycdn.com/files/2fd6a7cd-61ce-44b6-9177-db03e69e8a73/how_to_change_the_clock_on_a_pioneer_deh-p5000ub.pdf
    • https://uploads.strikinglycdn.com/files/a594602c-66bd-4398-9f79-0e3dfef78a7d/common_core_math_examples_grade_2.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_off00010170.bin
f524d2bca394a74f1426c5139f5505ccf705f7684127dd0dda20bb34cb8e5a6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 5176 bytes
font_01_sfnt_off00011309.bin
096782f7a914328721041a233d20ff14871c346e5e17a7fdd21de039cb60cac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11309 11528 bytes

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