Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed07d53547105357…

MALICIOUS

PDF

82.4 KB Created: 2021-03-01 01:59:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d443204e99e1dae260a5e15e661c08d7 SHA-1: 135d2c39eecf949000804dfa1d1f30c9dca0b7be SHA-256: ed07d5354710535792a5723be02d93fc27e65fd04a074a051a4567250e8a6893
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://mezovuduw.ru/aws?utm_term=free+victoria+secret+catalog+by+mail PDF link annotation
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/tuzujopi_xudipag_femudomag.pdfIn PDF document text
    • https://vokedovewugom.weebly.com/uploads/1/3/5/3/135349322/1260692.pdfIn PDF document text
    • https://xoxitugupara.weebly.com/uploads/1/3/1/3/131383959/3672102.pdfIn PDF document text
    • https://pabidiwamudobav.weebly.com/uploads/1/3/5/2/135299897/2b3e7ffae7.pdfIn PDF document text
    • http://itasda.online/tik_tok_audio_song_download_teluguyv59l.pdfIn PDF document text
    • https://mulomaninivoxom.weebly.com/uploads/1/3/1/4/131437045/2241172.pdfIn PDF document text
    • http://poxijirubulemax.22web.org/calligraphy_exercises_for_beginners.pdfIn PDF document text
    • http://zolekumosex.iblogger.org/najesoselowidov.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/what_is_stock_market_in_india.pdfIn PDF document text
    • https://butijewib.weebly.com/uploads/1/3/4/8/134886415/8292949.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://niforubuduxema.epizy.com/43427851196.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/how_to_calculate_f_statistic_from_anova_table.pdfIn PDF document text
    • http://tuzegonu.rf.gd/11469826751.pdfIn PDF document text
    • http://pujumek.myartsonline.com/wamam.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_off00010504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 5376 bytes
SHA-256: eff196a72193eec35469a633bc6d3563082665fa37f7f6962778a963f44dca5d
font_01_sfnt_off0001174d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174D 10904 bytes
SHA-256: c8f521345fff7bb790880248663534c2964edc090fe5a106244537beeaf82d8c