Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5b5baa2200fd52…

MALICIOUS

PDF

81.2 KB Created: 2021-03-06 11:34:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 1e20c24790ca62a1102f44ed64ec6e39 SHA-1: daf96067a0cecc1156cef3c52f6ddd3562e7f85a SHA-256: dc5b5baa2200fd52738ab29e386300e2ef02935d0025e58c34370a237a255344
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by an ML classifier as malicious and contains a large number of external links, many pointing to disposable or unknown domains. This behavior is indicative of a link farm, likely intended to manipulate search engine rankings or to serve as a distribution point for further malicious content. The presence of a 'download' button lure reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/strik?utm_term=different+types+of+school+syllabus+in+india PDF link annotation
    • http://bigpleasure.ru/love_dare_book_fireprooft7zbv.pdfIn PDF document text
    • http://winsl.space/63174925456i8vl9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_602b78f42b483.pdfIn PDF document text
    • https://temisufe.weebly.com/uploads/1/3/5/3/135384001/6cfd67.pdfIn PDF document text
    • https://toralalog.weebly.com/uploads/1/3/1/4/131436966/libuvisomik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5fea1ee5e898b.pdfIn PDF document text
    • http://circulshtangcalip.website/322526763256kpl8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371514/normal_6024a23c7904e.pdfIn PDF document text
    • http://sandiego-podcasts.com/vipilekamiza3ck2k.pdfIn PDF document text
    • http://sodahub.pro/20790486169rryfs.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/98669b6f-e65f-407e-b154-0f5b82285208/vibrant_matter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e628388-6c9e-4598-ab48-be969b47e114/how_to_do_quantitative_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3df978d2-fa44-42ba-a208-22f3537305cb/pigazusilagagat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a3a1ae-8f5a-4bd0-87a3-19d5e14fa4c1/what_is_the_thesis_of_the_communist_manifesto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c188249a-a868-458c-b923-7c9c696a48f3/jepasifinaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11fd977e-84bb-4844-a798-8e4a7fdf41b0/the_metamorphosis_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e7e2dc9-281b-401a-b20b-a4201ed3e4a0/2012_hyundai_sonata_hybrid_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf678931-2936-4605-a086-e95fdbaa3f88/5th_grade_envision_math_book_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aa5ee06-e23d-4f5b-8c18-a8bd7c858c10/samsung_refrigerator_rf4287hars_water_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5fc7f0c-ab7f-4c02-a529-2ce94805f0d4/hayward_ecostar_sp3400vsp_drive_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dbd501c-4be3-49f5-b44e-847a3ed12298/xalipefesoxurur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c76a71c-76b3-464a-a48a-edd649cce9ad/79013863294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41f96696-b3c0-4c03-81f4-827ff0f7e831/32996057795.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_off0000fe73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE73 5484 bytes
SHA-256: c2c6d8dd364fc9d790c8c067ef268a96a709ea3eab10a37a0ebb6f5e5464a6f2
font_01_sfnt_off0001111f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111F 11164 bytes
SHA-256: 61b97e3c2379a97131e6c2f0387cf3d75267d350adaf7020143cc71a6c5f1be4