Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac2b896bd6840c4…

MALICIOUS

PDF

92.7 KB Created: 2021-05-15 12:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5550858c75552d6f26a538571ac2d982 SHA-1: d7268537b680a0036b928a5e1e90ba8142b2ebb3 SHA-256: fac2b896bd6840c4bf6129a60b739a97b6b4152d9fa3b5ca0526268abd42fe02
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 pointing to disposable hosting services, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://seumenha.ru/strik?utm_term=what+is+the+difference+between+linear+algebra+and+abstract+algebra PDF link annotation
    • http://jaxixojuko.mypressonline.com/11671041978.pdfIn PDF document text
    • https://bolamowoxuwev.weebly.com/uploads/1/3/3/9/133997192/d8d739d1f.pdfIn PDF document text
    • http://nipijapogila.sportsontheweb.net/texodidituvatov.pdfIn PDF document text
    • https://powipopes.weebly.com/uploads/1/3/1/4/131406611/58e0bf99855a.pdfIn PDF document text
    • https://rawunawikurek.weebly.com/uploads/1/3/5/9/135967659/641172.pdfIn PDF document text
    • https://danexuxubusam.weebly.com/uploads/1/3/2/6/132695747/b8a67b86a3b29df.pdfIn PDF document text
    • https://tijozamuworibop.weebly.com/uploads/1/3/1/6/131607374/bazatota-kirolipoda-pulopoxe.pdfIn PDF document text
    • https://pofemazavuson.weebly.com/uploads/1/3/2/3/132303373/zeneka.pdfIn PDF document text
    • https://zewonawexekuke.weebly.com/uploads/1/3/4/3/134318694/8225786.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/29b207fd-bff1-4eec-827a-63045954058b/81979717168.pdfIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_3e42e943affe4347b97d86e14fadc36c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/073ce027-a7a4-469c-9d88-24c54cfce315/ponikub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2223093-3f82-4977-a2ec-85a6a2bf4adf/sijunizem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b5f744c-706c-46f1-b3ca-d3278ab050af/human_body_systems_and_functions_quizlet.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/spanishdict_formal_affirmative_and_negative_commands.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/6466668594.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/bootstrap_flight_booking_template_free.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/moultrie_mcg-13034_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/top_5_interview_questions_to_ask_a_candidate.pdfIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_a94aae9e962446d5a8b1e5a53cc36bc5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/066c0398-114b-4c85-b34a-f931c80caeec/common_core_ela_standards_grade_8.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/one_punch_man_season_2_all_characters.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C34 5208 bytes
SHA-256: 7185ff95f18c0e1076ec95c725ed509c84fd6bcfe54b55bd235280a918741f66
font_01_sfnt_off00012df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF0 11472 bytes
SHA-256: 66f64f958158a3d61b6c3a5136fe58ef6de1a237e9b2946d93833a8359ea062f
font_02_sfnt_off0001545c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1545C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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