Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad58e5d88f33a00…

MALICIOUS

PDF

82.5 KB Created: 2021-05-07 22:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3c8175f9340c701900f1a525223b3fa3 SHA-1: d7f2b8c04a24f2498fa7bb134db2c05ee7bd4103 SHA-256: aad58e5d88f33a000e4b00021fe4e71936bdc8935fd26f15dd31d3118cd96d1f
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/strik?utm_term=blue+dapple+mini+dachshund+puppies+for+sale PDF link annotation
    • https://renevemepo.weebly.com/uploads/1/3/1/6/131606397/1935412.pdfIn PDF document text
    • https://gefawopunov.weebly.com/uploads/1/3/0/9/130969454/varoxuvekor-xuwokedagid-banixiz-lemove.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/vuzuruzenibu.pdfIn PDF document text
    • https://jakuxilo.weebly.com/uploads/1/3/4/7/134711712/765686.pdfIn PDF document text
    • https://davixugamewa.weebly.com/uploads/1/3/5/3/135334906/d0e379fe8f277.pdfIn PDF document text
    • https://cdn.sqhk.co/fezusife/57ihgf6/small_business_continuity_plan_example.pdfIn PDF document text
    • https://nowujokawaj.weebly.com/uploads/1/3/4/6/134676947/5a3cfe46f38.pdfIn PDF document text
    • https://cdn.sqhk.co/barevirus/xghrhgH/70553871019.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/pegek/43982895435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee6b2827-1032-460b-b38f-46964b750fa6/troy_bilt_bronco_riding_mower_belt_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4887c3ed-fdb9-4f85-9baf-1c64a00155e3/plato_dialogues_reading_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f48f984a-2274-4ccc-bf51-b069bb6e48aa/pawerisulolelovoson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03943512-4c51-4f17-956b-630d4cb141bd/wumukekafemafulaxujuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ed2059-a8a1-43c3-a37b-226722ef3dc4/amazon_kindle_how_to_use_audio_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb3591d1-404d-4f30-b841-f733fa30f441/resumen_del_capitulo_5_de_mi_planta_de_naranja_lima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5eb35cf-8018-4d44-a5c0-586c8c1489c8/jands_vista_3d_visualizer.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/diesel_performance_air_intake_systems.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/xusuwuvinedev.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_off0000e99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 5444 bytes
SHA-256: 88532aca8d0f624774a3726c217d7dfb143fffc1d885e41118839890ee9c37dc
font_01_sfnt_off0000fbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 10932 bytes
SHA-256: fef3944a506d327bd8415b74e1fefd8bd3d434555d4387abacfda3518633728b
font_02_sfnt_off00012183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12183 17840 bytes
SHA-256: 343b22bc260019768a57dc82dd5b7a23c57d65ff8d49716c9b630660ae4c873d