Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac4622181d95420…

MALICIOUS

PDF

78.8 KB Created: 2021-02-21 11:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 01f3f3d3b075e5e01564a02a7a90883b SHA-1: de09b0e5ee9fec16e23dbfedfe340859e865bf57 SHA-256: 3ac4622181d95420d131732ee75e47b097e1556dae57581ec9fe18c91f589fd0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The presence of external URIs and the link farm behavior strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://druttle.ru/wix?keyword=adodb+recordset+vba PDF link annotation
    • http://morasufas.iblogger.org/5262254098.pdfIn PDF document text
    • http://criticcxck.space/total_conquest_mod_apk_offline_unlimited_tokenlo3qe.pdfIn PDF document text
    • http://sidanixom.22web.org/sebipasivawig.pdfIn PDF document text
    • http://ig-about.net/dragon_tiger_gate_movie_tamil_dubbedl3ztw.pdfIn PDF document text
    • https://dibasipelop.weebly.com/uploads/1/3/0/7/130738559/wofefemosi-pukejanatuz.pdfIn PDF document text
    • http://fbdirect.site/ways_to_listen_to_music_offline_free8z4cs.pdfIn PDF document text
    • https://mikuzowadakan.weebly.com/uploads/1/3/1/3/131383480/fd6466fcb.pdfIn PDF document text
    • http://saxefitipar.iblogger.org/campmaster_45l_fridge_freezer_manual.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/410a6ce.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/1400785017c27rv.pdfIn PDF document text
    • http://videohost.space/pezaxukekofusefewataw8wv8.pdfIn PDF document text
    • https://kovuvewu.weebly.com/uploads/1/3/2/6/132695697/lomojuzinanu.pdfIn PDF document text
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/rovativekigowazipiva.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://zozezofi.rf.gd/sodijuzadufefutotaxufup.pdfIn PDF document text
    • http://rapabilalame.rf.gd/converting_metric_units_worksheet_year_5.pdfIn PDF document text
    • http://vuduluxepo.epizy.com/60636333883.pdfIn PDF document text
    • http://rafoputoxuxu.epizy.com/gitixoxifesasigo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 4724 bytes
SHA-256: a825c5ee0770beef6e90b5db21df7821f1a486446595d2bdd885765b7d5acb77
font_01_sfnt_off0000fc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2F 10392 bytes
SHA-256: c8bed48cabc7c483037a7e31c38da609c2dd385d62d28eab78e989119dd33e87
font_02_sfnt_off00011fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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