Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e887cfabb67f691…

MALICIOUS

PDF

72.1 KB Created: 2021-03-27 11:26:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 95695553cb7f878c4a0fddf968d1ccdb SHA-1: e708d51b9d04d18e2847afa7127cde6db18cf476 SHA-256: 9e887cfabb67f691de6e407bc1e67d261afc92ab2eac9cc0c98853a3d9d8c6da
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/123?utm_term=madlipz+khasi+funny+video PDF link annotation
    • http://zitirisiz.mywebcommunity.org/hayward_power_flo_matrix_rebuild_kit.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/WlijJdA/jixotapipifegedoxezora.pdfIn PDF document text
    • http://womuvizitina.mywebcommunity.org/sipexizimuvigikepeliga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411493/normal_5ff1c33fee34f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380705/normal_5fec0d17421a7.pdfIn PDF document text
    • https://cdn.sqhk.co/nakusunegud/haicvig/morton_salt_meat_curing_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/zunowexafa/PhchifV/10462765019.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/69844350024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485807/normal_5fe866d19633b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420454/normal_6056ae7754744.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/bc0376c8-672b-466e-a636-d090f1245927/74494612347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e1c4efe-76cb-434f-8ba7-52dc0956e7bc/waste_king_8000_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc73890d-bb01-4ec4-94c3-c5d48267a24b/ali_bahrami_object_oriented_system_development.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/simupuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd06af5-31c6-42d2-9b43-c62709811347/xenimajevamixo.pdfIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_f862f921d8774ee9926aeebfddc2545e.pdf?index=trueIn PDF document text
    • https://0a38098d-26c8-4844-ab0b-2dfc398d7f8d.filesusr.com/ugd/fffd55_f533201225454c2cba3722af020d9f30.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b53a6da-706b-45ea-a9ec-279d0d90b43f/20_verbos_irregulares_en_ingles_en_presente_pasado_y_pasado_participio.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/25173774783.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_off0000de8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8E 5312 bytes
SHA-256: 07ea96664b25ffcac863b2875f6c363ecdafd0e433e2ae1991e06303be9c3776
font_01_sfnt_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 10480 bytes
SHA-256: 498b11fe95f40aa35223eee324e0c9fbae257b949532146dd386d413017c1d01

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