Malicious PDF — malware analysis report

Static analysis result for SHA-256 90141b3d77c8a9fd…

MALICIOUS

PDF

72.4 KB Created: 2021-04-08 16:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4db07c0098472221294f9613a7de9100 SHA-1: 505a5ce08d2110dd6cfdf6dbcacb5c602a40aa24 SHA-256: 90141b3d77c8a9fd0131f868c4ec0e609fc50d8b5354ee5bc71bdef86db003f9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://dugedepap.ru/strik?utm_term=oxford+picture+dictionary+for+the+content+areas+pdf PDF link annotation
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/6415127.pdfIn PDF document text
    • http://itdomen.fun/bob_stroller_revolution_pronoa3i.pdfIn PDF document text
    • https://nepefesin.weebly.com/uploads/1/3/1/4/131410606/4501691.pdfIn PDF document text
    • http://imm-shoes2.club/escape_room_app_answer_level_38p258z.pdfIn PDF document text
    • https://melesanej.weebly.com/uploads/1/3/1/1/131163783/b1f4bc48c11.pdfIn PDF document text
    • http://prod-fruit.space/whatsapp_status_saver_for_iphone_6sygc9c.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/dKgeEfU/photo_math_problem_solver_app.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/jV8gc2Q/70193588288.pdfIn PDF document text
    • http://50offshop.pro/2020_maserati_granturismo_sport_priceqkl6i.pdfIn PDF document text
    • http://about-igsupport.com/whirlpool_refrigerator_model_double_door_3_star7kcvm.pdfIn PDF document text
    • https://nikirepe.weebly.com/uploads/1/3/4/7/134743809/xobexiz.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/medaliwifufugel/71926632461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85812fb7-f47f-4098-a208-f5f9b3edfe0c/adobe_acrobat_serial_key_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4df3ea93-4ce2-4534-87d3-b8b81345046d/pekiweradiwivigijaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db88ed26-c5ad-4ff6-b16a-92c2302c2886/where_are_wave_hot_tubs_made.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/4755499418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c1ea13a-90b4-4f18-8c97-13d00dcef429/9254147907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2d3fc41-03f1-4e50-a8fb-8c698b4fc82d/45675208209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4e08fba-0a55-4bb9-bb1d-3bd69c1e48a5/33940006751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c5fedeb-1d8b-404c-9c39-5c5c73640575/what_does_praying_rosary_beads_mean.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_off0000dcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB4 5408 bytes
SHA-256: 5b0a6577ab9b136265a8c8e9e80270c3062d8a92e77fe038b32ebc086e0d0092
font_01_sfnt_off0000ef23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 10944 bytes
SHA-256: 7625b7a9803550a5e9f0d6e444393713c20d86a0fd4d5e1492ff6901f2b9403e

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