Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d4b9c8c6168577…

MALICIOUS

PDF

77.1 KB Created: 2021-04-15 15:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9b9b4c1e44ffcacc20a1f2cc904caf4a SHA-1: 5bcb3d31e31c0098c4c32085c1bf1ece150d1c4a SHA-256: 61d4b9c8c61685773ac1addb145f34b6f132c65325c3b2ef40931e60679658bc
74 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution 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 0.9997

Heuristics 5

  • 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://jumiwimov.ru/strik?utm_term=how+to+edit+an+existing+logo+for+free PDF link annotation
    • http://tebipadize.iblogger.org/soundlogic_xt_bluetooth_receiver.pdfIn PDF document text
    • https://cdn.sqhk.co/silinetufid/chijif5/driving_school_academy_2017.pdfIn PDF document text
    • http://galabogenezoso.getenjoyment.net/should_a_smoke_detector_have_a_green_light.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/h5shi6H/93209706157.pdfIn PDF document text
    • http://tanitebose.22web.org/11067080790.pdfIn PDF document text
    • http://ratedewu.scienceontheweb.net/adverbs_in_english_grammar.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/1AjfgeN/152838728.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/c6504155-8bb7-409b-9058-ac9240dd8348/11365024485.pdfIn PDF document text
    • http://pujuban.rf.gd/13154152604.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_50829039a7874844baa0cc10f5f21800.pdf?index=trueIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_8c4d0005fcd74b3fb23f2cad9e7847ef.pdf?index=trueIn PDF document text
    • http://rokodejufoda.rf.gd/70621908408.pdfIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_d1645704037e499493ecd9d8ff3ebea3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d744fdd8-0032-4f87-99a0-db2262eeb0c4/girojumivenazomujojejare.pdfIn PDF document text
    • https://38c8c62e-1823-4c1e-8220-bc61efcc8a1c.filesusr.com/ugd/c24b9b_bb991f21fcad46ad9490ff9852fdf88e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69126d90-0b79-4c51-aad7-2deb6fb30331/solving_multi_step_equations_holiday_coloring_activity.pdfIn PDF document text
    • http://gupatevefojip.myartsonline.com/74797361871.pdfIn PDF document text
    • http://zibelasavu.atwebpages.com/42734604003.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_d3abc31a2cec4f4f94fb1347c2dcf26f.pdf?index=trueIn PDF document text
    • http://kuduveledaw.rf.gd/94787349803.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 5196 bytes
SHA-256: 15339767a20b6bf46e4f748bd80fa67837f5bd745dd1007f74a49abb51ce392f
font_01_sfnt_off00010303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10303 10584 bytes
SHA-256: e485bbb3bc0d6aa394dcd2e14589ec7ce7b034d1398d3d97f0df6be21ab4dfa8

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