Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33579c036c1830b…

MALICIOUS

PDF

78.3 KB Created: 2021-06-08 23:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 705424cdcac1a7ff2e8d1f60f62fadd6 SHA-1: e20df115d7e58a446be188fa5d2a40f3c108b423 SHA-256: a33579c036c1830b9e614a8cdd6a326fe7c609d4b474227486927fb05c9e5ce0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point to the potential for JavaScript execution (T1059.007) to facilitate redirection, and the overall nature suggests it could be delivered via spearphishing (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://smidgel.ru/pbw?utm_term=dnd+5e+oathbreaker PDF link annotation
    • https://nawomabikovuz.weebly.com/uploads/1/3/4/7/134730946/mosamoti-wuxuzusipavazi-guwumanib.pdfIn PDF document text
    • https://mawatewif.weebly.com/uploads/1/3/0/9/130969671/gukanudofegus-mavejinozofoli-jatonono-fadupobijux.pdfIn PDF document text
    • https://xukusoresi.weebly.com/uploads/1/3/4/4/134488105/nebaxulogako_lilaveranijam.pdfIn PDF document text
    • https://fakuduvedutew.weebly.com/uploads/1/3/4/8/134866980/mudaxebexuxun.pdfIn PDF document text
    • https://zikivunebek.weebly.com/uploads/1/3/5/9/135964247/pumagurubuzorepita.pdfIn PDF document text
    • https://ditaluli.weebly.com/uploads/1/3/5/3/135325413/vewobonoxawadin-fugafodatazup-banomexifumujen-lotuzej.pdfIn PDF document text
    • https://mepaxekedin.weebly.com/uploads/1/3/4/5/134514716/2fcc5.pdfIn PDF document text
    • https://fevixivosetakub.weebly.com/uploads/1/3/2/6/132681861/saxepoxefofogefet.pdfIn PDF document text
    • https://xufizuwerab.weebly.com/uploads/1/3/0/7/130738786/1808725.pdfIn PDF document text
    • https://dizavobezovedup.weebly.com/uploads/1/3/5/3/135313146/sojonozelebugirumuti.pdfIn PDF document text
    • https://boripate.weebly.com/uploads/1/3/4/5/134590871/wininobonigez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc243e3d-479a-4041-a358-4016c914a913/64113407123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36811b11-e478-4fb3-9efa-6d3d624f594b/74561779778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7027384-12d8-42e4-9094-1aec4876c24d/exterior_angle_theorem_worksheet_doc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44e9f987-dc58-4dba-aa6c-d8496223937e/air_force_ones_white_high_top_womens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/103af6ab-a5ca-40c9-b54f-17544063395e/affidavit_of_loss_passport_template_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c7df86-277c-4704-b2af-8b8cb6706f37/how_do_i_reset_my_sportdog_collar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fd7c789-6ad7-4dba-8a47-a920ecc3464f/85714698197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e62362b-72ab-47d1-9e11-f23196202343/zofinivomofexalizopiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86b4966f-b2ab-4808-90ca-be5c812697e1/how_to_clean_boneco_air_o_swiss_humidifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd55773-3bd5-40d6-b74a-1efcb592a496/togizimuxifezudo.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_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 5028 bytes
SHA-256: 2d43a1a6b86eb7eb51b03227126e2c4989fcb8666d623cf996ca9207abc9b686
font_01_sfnt_off000108cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CB 10360 bytes
SHA-256: f4fd1365c3c3201120141ba3e3570fff39a203ab47db1acbf0a67f843cf6f1bb