Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36f3f347cfb5cb1…

MALICIOUS

PDF

82.6 KB Created: 2021-03-27 23:50:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cf743870414c2dddd4b19ce4a235b3f SHA-1: 506b9c1bab79ac4a47102de572fa98b8807cb8b3 SHA-256: a36f3f347cfb5cb120501cbd038adfb56b0083b25f1980d2a99228fed551d511
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://xezojetit.ru/123?utm_term=math+printable+worksheets+addition+and+subtraction
    • https://nirasiban.weebly.com/uploads/1/3/4/3/134344158/535f5e7.pdf
    • https://sifajovu.weebly.com/uploads/1/3/4/8/134874608/getik.pdf
    • https://jokiputukalak.weebly.com/uploads/1/3/1/1/131164130/radimuxudanunisisek.pdf
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/dulaxowe.pdf
    • https://xokekujederal.weebly.com/uploads/1/3/0/9/130969763/8534984.pdf
    • https://zexivavu.weebly.com/uploads/1/3/4/8/134872555/musesijaragoj.pdf
    • https://cdn.sqhk.co/xalesikozip/h5zgggh/tenasorolim.pdf
    • https://cdn.sqhk.co/wugunifikezu/gPjjhgs/halloween_vampire_makeup_looks.pdf
    • https://palotuzumi.weebly.com/uploads/1/3/5/9/135991270/6624806.pdf
    • https://baludofagufa.weebly.com/uploads/1/3/4/0/134096440/8261a7ef8f68.pdf
    • https://xepidazezupos.weebly.com/uploads/1/3/5/3/135343087/bb5dc2c86.pdf
    • https://tilotifibow.weebly.com/uploads/1/3/4/5/134505855/aeb6d7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kobesut.rf.gd/puwivebaxa.pdf
    • https://s3.amazonaws.com/mizeteb/come_eliminare_un_account_instagram_da_android.pdf
    • https://s3.amazonaws.com/metubevozisul/59870900569.pdf
    • https://uploads.strikinglycdn.com/files/2c563d1e-9797-45e0-ab9b-8f37e47e1259/xewexezolukafodevibov.pdf
    • http://xonukekavufimil.epizy.com/verizon_wireless_lg_android_phones.pdf
    • https://s3.amazonaws.com/wukara/chelsea_manchester_city_match_report.pdf
    • https://uploads.strikinglycdn.com/files/a7fbbfef-5da4-4b4e-a0b5-d1d00af0bc22/how_to_list_skills_on_a_resume.pdf
    • https://s3.amazonaws.com/lupuvogotog/how_to_make_a_homemade_notebook_out_of_paper.pdf
    • http://rixifazawap.epizy.com/20617049705.pdf
    • https://uploads.strikinglycdn.com/files/e8532f3d-b21d-4df1-a35f-e54d67fd239c/1971567010.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee1.bin
17646b98ae0312d8de52b6717c1da074388ca5b76a5fa5ccd289ab5cf3ad7ccf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 5460 bytes
font_01_sfnt_off00010184.bin
2e69f9abc1c78f5c6a528ba9c9431c696dc0b795f3c277777730074f9abba678		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10184 11200 bytes
font_02_sfnt_off000127ed.bin
354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127ED 16036 bytes

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