Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4f544eac7ec9fe…

MALICIOUS

PDF

81.9 KB Created: 2021-04-20 09:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6f36a63da4cf88ccd074dcaae1b44a3c SHA-1: e7c830dc0d676c404fd484394809c26fd308e03c SHA-256: ac4f544eac7ec9fee6f899d416a6489753a7471516ce78e60f114b763f27f67d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as a link farm, containing a large number of external URIs pointing to various domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The presence of numerous links, many hosted on disposable domains, suggests an attempt to redirect users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://kuzutuzo.ru/strik?utm_term=subway+surf+hile+indir+oyun+club PDF link annotation
    • http://bunutib.mywebcommunity.org/autonics_product_catalog.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/5a55e656a581fe0.pdfIn PDF document text
    • https://mitumeme.weebly.com/uploads/1/3/4/8/134879381/1394847.pdfIn PDF document text
    • http://icily.xyz/what_does_service_mean_on_mini_cooperakefh.pdfIn PDF document text
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/xudujadegono.pdfIn PDF document text
    • https://cdn.sqhk.co/guxudakakali/Ghaifhc/41346378005.pdfIn PDF document text
    • https://fokifukamanur.weebly.com/uploads/1/3/0/8/130874497/8d711e0.pdfIn PDF document text
    • https://rolorizumi.weebly.com/uploads/1/3/4/3/134316308/rogosopemilosi.pdfIn PDF document text
    • http://raisinshub.pro/pre_kindergarten_worksheets_free_downloadbqr6d.pdfIn PDF document text
    • https://cdn.sqhk.co/tidelefuzin/0Wdijja/koforusufemubewusali.pdfIn PDF document text
    • http://boguzimaro.getenjoyment.net/79336300274.pdfIn PDF document text
    • https://xabizukilitexe.weebly.com/uploads/1/3/4/3/134335342/214a39f8.pdfIn PDF document text
    • https://cdn.sqhk.co/zisenusaf/hihwfii/stiletto_nails_long_glitter.pdfIn PDF document text
    • http://redofokotab.sportsontheweb.net/new_historicism_in_literature.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/bc30c68b56df.pdfIn PDF document text
    • https://cdn.sqhk.co/zobadaxejaz/gd8jdhh/27118494172.pdfIn PDF document text
    • http://kersita.fun/sujet_brevet_histoire_geo_2019wd20s.pdfIn PDF document text
    • http://fortuneo.biz/data_structures_using_c_balaguruswamy_free_download9j4c6.pdfIn PDF document text
    • https://xufetujada.weebly.com/uploads/1/3/4/7/134745175/dakakikaj.pdfIn PDF document text
    • https://cdn.sqhk.co/wetotuluxe/jiiifjf/chura_ke_leja_ringtone.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/2065690.pdfIn PDF document text
    • https://fixelomutitag.weebly.com/uploads/1/3/4/3/134339240/6278709.pdfIn PDF document text
    • http://nuvagefo.medianewsonline.com/jadoxu.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/polexebuj/13331968901.pdfIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/kiwolipivug.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/agile_scrum_backlog_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/71892824541.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/antivirus_for_pc_with_crack.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 5544 bytes
SHA-256: 1f0f5babf626435af214049693326b2f7ae03dcd92f14c0ba5d3369f07623523
font_01_sfnt_off0000ffce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCE 11720 bytes
SHA-256: dd06446c009014cae1cf366127952a601e7dcf681d52b9277efab8613843bb96
font_02_sfnt_off0001249d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249D 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848