Malicious PDF — malware analysis report

Static analysis result for SHA-256 3257740bdcec279e…

MALICIOUS

PDF

73.9 KB Created: 2021-02-19 20:08:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6363c8b608ef4f3df68b13e18d04bc37 SHA-1: a7e264d24ad265793488db8cd9fbf04c6f7b5a4e SHA-256: 3257740bdcec279e6f72e0c8fd6363fd5c3810f1c82f3385957fbcd877462423
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and it contains numerous external links, indicating a link farm or phishing lure. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document body contains sequences that mimic command execution, potentially to trick users or exploit vulnerabilities. The presence of embedded URLs and the PDF structure strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://jottigo.ru/strik?utm_term=milk+on+21+day+fix PDF link annotation
    • https://surinulijo.weebly.com/uploads/1/3/4/6/134648677/e7bab0ad03d215.pdfIn PDF document text
    • https://xaxozugine.weebly.com/uploads/1/3/2/3/132303195/41f414.pdfIn PDF document text
    • http://hotsales-com.xyz/ciclo_ovarico_y_menstrual_es_lo_mismoyvoiv.pdfIn PDF document text
    • http://sun-italy.space/wanubirudoponuac43.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/BZemidX/century_21_stores_closing_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/bidekidarub/c2QckbA/mens_hairstyles_long_on_top_curly.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/yng1jgx/pitimoto.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/zuvomafoda/gjfhjbd/minecraft_egg_wars_server_turk.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/jagibuvat/MjiPBmE/nizoxipe.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/birenejar/VmGtsq2/subway_train_runner_2019.pdfIn PDF document text
    • http://gmetry.online/which_is_better_beats_studio_3_or_solo_pro0tu8z.pdfIn PDF document text
    • https://cdn.sqhk.co/nubowolimit/3ibgjii/xajukuse.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/fenatagazise/7845839040.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/46937016747.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/aeroplane_games_free_for_android.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_off0000e4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FA 5048 bytes
SHA-256: d7c8eba04c890dd15641a383e3c6bc652f0f161621afe32c3a6771c8c9f6057a
font_01_sfnt_off0000f661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 10728 bytes
SHA-256: ee735d78150658df57ee7fbf7e681159233c1d78a8132a8ef9810c159b2d12c1

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