Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad48fb724051a12…

MALICIOUS

PDF

107.9 KB Created: 2021-03-25 05:05:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ec1be09197c29bcae55c68ee5327c98 SHA-1: 28f6ad37654c5a17bf0c2cc713cb95d4f4425e62 SHA-256: aad48fb724051a12b9df01f4b75f4709f1e8c14f8c2c9d73d434fc4bc9c39974
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to unknown or potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=surat+al+kahfi+ayat+1-+10+muzammil
    • http://hallop.xyz/more_than_words_tabs_tutorialil1s9.pdf
    • http://xutexukoxobofi.mywebcommunity.org/52627174107.pdf
    • http://fevinoreniwelik.sportsontheweb.net/kesizivizuze.pdf
    • http://ericksandoval.com/how_to_reset_alarm_system_adtzjxbp.pdf
    • http://towufato.mywebcommunity.org/catholic_holy_bible.pdf
    • http://scarcebook.com/how_many_bodies_of_water_borders_canadacqf56.pdf
    • http://zakosemej.mypressonline.com/25070822649.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/09eaa674-38a0-4e42-a93b-708b0f83e3f7/the_giver_chapter_4_setting.pdf
    • https://s3.amazonaws.com/xunilukegez/what_extra_books_do_the_catholic_bible_have.pdf
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_11af8f7187d74d8bba9b1c1c2399770b.pdf?index=true
    • https://s3.amazonaws.com/wujodibu/vavubopezuzasu.pdf
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_f11f2cbed8de4a78a883be30c259a4b9.pdf?index=true
    • https://s3.amazonaws.com/mekonulegipero/64213798400.pdf
    • https://6acbaf94-bc62-4fdb-9a00-914544f0b606.filesusr.com/ugd/3ee118_73ee5ab76ef345a89d6327f220e29af8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fdd92d70-96b9-4d03-acd2-a4f46be3c70b/kung_fury_movies_like.pdf
    • https://uploads.strikinglycdn.com/files/b01d4bce-8032-4520-99e1-64d1388364f4/funciones_trigonometricas_inversas_ejemplos_resueltos.pdf
    • https://uploads.strikinglycdn.com/files/c2f3ee98-8909-41c2-9e90-ca6c5ac9f6f8/the_universe_next_door_chapter_5_summary.pdf
    • https://s3.amazonaws.com/voxulija/13192963228.pdf
    • https://s3.amazonaws.com/xiwevitox/poetic_edda_best_translation.pdf
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_4ab7147b0f784e5b90db8719b4fe021a.pdf?index=true
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_e19387949f094df6ab740f15cdf47e22.pdf?index=true
    • http://fadezanunadafik.myartsonline.com/conflict_resolution_in_the_workplace_training.pdf
    • https://s3.amazonaws.com/luramamelolem/48616938622.pdf
    • https://s3.amazonaws.com/sitozi/65338654962.pdf
    • https://uploads.strikinglycdn.com/files/76082fd8-4d40-4c96-9c34-a69cbef25f72/4756425264.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000168b8.bin
bd95537cbfd052316e642ec197ae8aec74879cd70235dfa02e0bf1478e4aca91		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x168B8 31748 bytes
font_00_sfnt_off00013161.bin
d6ee9856daf2add68bc1a4d141420c613ed52bd0f1f549844ef6e5c9dfc29907		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13161 5376 bytes
font_01_sfnt_off00014396.bin
101e086fbbff94c0d8ff7ef56ce19842a7fffc1aa16b5741a23a1b74d7bde8ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14396 11576 bytes

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