Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb39d3d84ef08151…

MALICIOUS

PDF

82.7 KB Created: 2021-02-27 06:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d7adf986984a2f93d9bf37fba61bf979 SHA-1: 1db116e415a4fb14dc53159ef539ad834e24ec2f SHA-256: cb39d3d84ef081512f7f3781b044f055367a69034197c468183cb75e5c5d4425
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, characteristic of a link farm, with the primary purpose appearing to be the distribution of further malicious content. The document body, though heavily obfuscated, suggests a lure related to 'relative humidity worksheet pdf'. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=relative+humidity+worksheet+pdf PDF link annotation
    • http://netewe8.xyz/best_figure_drawing_bookshm3p1.pdfIn PDF document text
    • https://cdn.sqhk.co/pabopimi/Yjfjgjc/history_definition_computer.pdfIn PDF document text
    • http://allerlo.xyz/starbucks_barista_job_descriptionnetdj.pdfIn PDF document text
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/4b0490aacfc2ca.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/Fpkibvo/89968637816.pdfIn PDF document text
    • https://cdn.sqhk.co/muzolorakow/LXbYiji/samsung_internet_browser_apk_beta.pdfIn PDF document text
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/8369032.pdfIn PDF document text
    • https://cdn.sqhk.co/somepizeko/jjjYxgh/can_knockdown_game_download.pdfIn PDF document text
    • https://vunejodi.weebly.com/uploads/1/3/5/3/135382889/25031e7b4158.pdfIn PDF document text
    • https://cdn.sqhk.co/zedawuzijis/2ihIibN/free_survival_fire_battleground_game_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pamomusemida/jbhfDuG/21157991052.pdfIn PDF document text
    • http://neuroncraft.online/yii2_gii_form_generatorkk7on.pdfIn PDF document text
    • https://cdn.sqhk.co/movijomo/rHkjc9n/minecraft_world_download_tutorial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 5380 bytes
SHA-256: 50a9ff780e5e5963b69bf9771aae90efed21edb2f37c5e39e80a2d6096ebdb3c
font_01_sfnt_off0000f661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 10504 bytes
SHA-256: b9b1eae0f93e50292f340a1a35a4ec92d2b1104a4dba7bc393205eda390acdf1
font_02_sfnt_off00011a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A99 16184 bytes
SHA-256: d844be97f64c35dabc0548848de40e53fd7a7cd0e22c075347775e7927809021
font_03_sfnt_off00012fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB5 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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