Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc9acf3303f4f11…

MALICIOUS

PDF

71.7 KB Created: 2021-03-17 09:56:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 50c3a8fc61ec6b7eb4cf6c630748de55 SHA-1: fab97605203adf84c115b0f1f0031c09dec5c84c SHA-256: dcc9acf3303f4f11b13106a7c7a51145d25869ed6c63a57dd40137752548cca3
186 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious content.

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://soxebez.ru/award?keyword=calendar+2020+year+pdf PDF link annotation
    • http://fevinoreniwelik.sportsontheweb.net/hola_que_tal_como_estas_de_donde_eres.pdfIn PDF document text
    • https://jewukezi.weebly.com/uploads/1/3/0/9/130970006/5218250.pdfIn PDF document text
    • https://rerararomimin.weebly.com/uploads/1/3/1/3/131383042/5393201.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/firel.pdfIn PDF document text
    • http://freshmind.net/rinnai_gas_log_heater_operating_instructionskgsz0.pdfIn PDF document text
    • https://raxopukefafifi.weebly.com/uploads/1/3/2/6/132695755/f6c9c.pdfIn PDF document text
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/9002259.pdfIn PDF document text
    • http://qrettalq.online/mental_floss_magazine_free_downloadi0wcm.pdfIn PDF document text
    • https://vutavevivusupe.weebly.com/uploads/1/3/0/7/130776898/nezidi.pdfIn PDF document text
    • http://kafalukuwemi.mygamesonline.org/zadifixojixosawafixete.pdfIn PDF document text
    • https://zujavezamuni.weebly.com/uploads/1/3/0/9/130969293/lagujinomugebetijene.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/24060902289.pdfIn PDF document text
    • http://braco.ru/audio_technica_at-_lp60usb_manuallwr3g.pdfIn PDF document text
    • https://rubegibadamu.weebly.com/uploads/1/3/0/7/130738913/8012374.pdfIn PDF document text
    • http://wgathering.org/866296015829oss5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pirafabitibabik.rf.gd/baritone_ukulele_songs.pdfIn PDF document text
    • http://pujumek.myartsonline.com/xofanawif.pdfIn PDF document text
    • http://vazorilumi.epizy.com/67619966115.pdfIn PDF document text
    • http://wuzuferopo.epizy.com/gst_annual_return_format_in_excel_latest.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_off0000dbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE8 5140 bytes
SHA-256: 2b2ebb3467febe31081d7c95ab6c76b79c8e0cdf6ef23549bb31c6249931d058
font_01_sfnt_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 10680 bytes
SHA-256: d1906f1ba48202960f5f5cf29030072447830201c58cccb12c11ab98fc916ce4

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