Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f917b75d6dbca6…

MALICIOUS

PDF

83.3 KB Created: 2021-02-27 20:49:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 07395a7d898b5180f6db3371d7b9adb0 SHA-1: 10d71e6c9046bdc1044353911fa86df93288650b SHA-256: d6f917b75d6dbca67f15807f96ab8e7c836decb2abe15ae7517be6f83c45eadc
134 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm designed to host malicious content, specifically a lure for downloading an Android application. The embedded URL points to a resource related to 'kingroot apk', suggesting a phishing or malware distribution attempt. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/wix?keyword=download+kingroot+apk+for+android+6.0 PDF link annotation
    • https://cdn.sqhk.co/gotulurowav/jiFhhdc/dakuvexi.pdfIn PDF document text
    • http://healthytrands.com/nixez0rt1g.pdfIn PDF document text
    • http://miwopejodap.iblogger.org/12920874733.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://goterarok.rf.gd/jugosawililuzatesulujo.pdfIn PDF document text
    • http://xidozex.epizy.com/rogavoletegelete.pdfIn PDF document text
    • http://vaguwiraji.rf.gd/tomejegaraxuriwapegog.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/free_printable_alphabet_chart_black_and_white.pdfIn PDF document text
    • http://wasaxeradiko.rf.gd/the_song_criminal_by_britney_spears.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/assault_bike_workouts.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97D 3136 bytes
SHA-256: 6487091c0070741e646db4a1cda49bb5dd8928231115cd9838b724a369c8679e
font_01_sfnt_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 5516 bytes
SHA-256: 222fbe7bbc6e328600017361b3b1e6362db73d4766104e06282578f6d52ec368
font_02_sfnt_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 4120 bytes
SHA-256: b211e33e0d6004894b9d8c56f00253464af6302eff6beeadb09e7c532f7092c1
font_03_sfnt_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 10556 bytes
SHA-256: ae00930b6ea66356a0cb28e67d3ce8ec577cc8f369971520a040b4f61549403b
font_04_sfnt_off00012a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A67 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073