Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d68b913567d5b1f…

MALICIOUS

PDF

78.4 KB Created: 2021-05-09 23:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9952b64c4325c225cf610c19ec130aae SHA-1: 73956b27471b6860c93cd4b7c5a306c1ec8b3290 SHA-256: 2d68b913567d5b1f240ae56b63177bcac78041c7379dcb31c52292b0a43d846e
196 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of an SEO link farm and uses an image lure to redirect users to a phishing URL. The embedded URL `https://mezovuduw.ru/strik?utm_term=total+quality+management+definition+by+authors` is identified as a redirector, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=total+quality+management+definition+by+authors PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404520/normal_603debb870497.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/ja6gdiF/pugodorujipodelaradusizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450640/normal_5fd34deda796e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455198/normal_5fcdb2210b760.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/zighh8m/fomopuwiw.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdfIn PDF document text
    • http://zumufufup.sportsontheweb.net/degegaro.pdfIn PDF document text
    • https://cdn.sqhk.co/valibekarofu/geUgjjX/regusovenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446034/normal_600bdc9eb0983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402944/normal_600d354eab860.pdfIn PDF document text
    • http://jawixogu.mygamesonline.org/38211545692.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/75038583498.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/vegokigog.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_77bff2ebe5a7489aabc2e57d9f0f4abb.pdf?index=trueIn PDF document text
    • http://jomupaz.myartsonline.com/denuxevokidajagenoje.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/human_capital_planning_template.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/cbt_nuggets_ccna_200-_125.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/59420294358.pdfIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_163878cda4f643bb9f237b2c4487f9c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genijusemu/23128078179.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/food_allergen_sheets_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/10484344966.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/chaise_haute_bb_en_bois_transformable.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_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 5640 bytes
SHA-256: 4453ec762bd5932ac6982ce1cf1b8f9aa2dc45cfab38124f40604a500f707636
font_01_sfnt_off00010777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10777 10696 bytes
SHA-256: c36716cb544f6c2fdeabba22549ecf0831d613082c326cba6e1f916f0888505c