Malicious PDF — malware analysis report

Static analysis result for SHA-256 661db6a957c8cb22…

MALICIOUS

PDF

73.1 KB Created: 2021-02-22 16:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c09af94486ff9dfb192c90062f33c607 SHA-1: 93cc7911f56a3dfb8fc5887c7fcc53e56c620edb SHA-256: 661db6a957c8cb220075abf6863bc2870a8f88f93f1a8ee7f6661d1fcf4aa0f9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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.
  • 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://baarspo.ru/strik?utm_term=why+is+yahoo+my+search+engine+on+google+chrome PDF link annotation
    • https://lonunupamazukev.weebly.com/uploads/1/3/4/7/134711915/63bb7bb0398.pdfIn PDF document text
    • https://cdn.sqhk.co/zotenejek/heiilhh/givisuzorujugapirejibi.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/ruwoxopupusuzim.pdfIn PDF document text
    • https://lopatitegadusi.weebly.com/uploads/1/3/5/3/135311006/5919332.pdfIn PDF document text
    • https://cdn.sqhk.co/teganipuputu/p8gfQhh/kirubojenuraginajisof.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/hdVpKZE/dotuwure.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/fboXiiX/11253700811.pdfIn PDF document text
    • https://cdn.sqhk.co/webunojixisa/dgjgdhj/rummikub_4_players_how_many_tiles.pdfIn PDF document text
    • https://xomunulozesini.weebly.com/uploads/1/3/4/0/134018183/9a16a770.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/fjfPia7/todolist_react_github.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/Oig3hjq/english_text_stickers_for_whatsapp.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/tipikaxe/doralasisibosedor.pdfIn PDF document text
    • http://sivopob.epizy.com/28351499490.pdfIn PDF document text
    • http://xolemobubusosi.rf.gd/banana_chacha_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/31159901965.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/viwipewebatofavo.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/m._s._sheet_gauge_to_mm.pdfIn PDF document text
    • http://rowesotinik.rf.gd/carpal_tunnel_syndrome_causes.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/princeton_review_sat_subject_test_chemistry_prep.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_off0000e17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17E 5328 bytes
SHA-256: 7a7bd9b140ef9cb236b11e9733599b50a1d37ead23f0ece49ddab4ded5777c99
font_01_sfnt_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 10348 bytes
SHA-256: 2c1a05a8ab23da09b949d6e06e451d80d8a57969cff187319bb1decb4bf85453

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