Malicious PDF — malware analysis report

Static analysis result for SHA-256 c215b73542fd49a1…

MALICIOUS

PDF

78.6 KB Created: 2021-03-19 22:50:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: be739e674fc64023d1aa886743bf4d0d SHA-1: 5fd7df452cd3d5c5c3cf1d9dc7efd61572e661fb SHA-256: c215b73542fd49a1f701da56f2a7350b1313e7385313b566bed93847cbc3eb0d
134 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to domains flagged as disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest a potential for directing users to malicious content or phishing sites.

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/123?utm_term=archery+games+hack+apk PDF link annotation
    • http://jajuviramigawo.medianewsonline.com/understand_stock_market.pdfIn PDF document text
    • https://cdn.sqhk.co/vetejevibas/NgdXhh9/ml_wallet_app_free.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/what_is_single_phase_and_3_phase_motor.pdfIn PDF document text
    • https://cdn.sqhk.co/dezosanag/gc2Sfhj/polaroid_originals_onestep_black_friday.pdfIn PDF document text
    • https://cdn.sqhk.co/dufimogemeka/jcO3khb/14748492522.pdfIn PDF document text
    • http://visetazide.medianewsonline.com/60722054986.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/f1712548-9639-4b23-8820-4b1db0f1ed9c/how_to_set_timer_on_cuisinart_extreme_brew.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/labalatofevul.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/35360728586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2e32dc3-2ade-4edc-b4f6-57e2529f367e/torts_law_outline.pdfIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_778d4186a3114867af4f2b2db5bf4cfb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d88bfa-3718-49bd-9c45-773ba749b197/mexizokizugopejowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38276f5a-3dcb-4121-a0be-e1c29fb2aefe/sex_on_the_beach_recipe_with_chambord.pdfIn PDF document text
    • http://dowafirowelumex.atwebpages.com/neato_robot_vacuum_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e39a3afa-91f9-4aef-ba0d-77f94f36b609/rofogolimixejijuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6879f20-2b7f-488f-8c7e-ce960595e35c/89209372710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e3878c6-f8b7-4230-9424-90a431ea3c64/how_to_use_my_camera_as_webcam.pdfIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_b373cec04de7472d816a047df0e3a373.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/17080e58-e986-4c3e-ae97-2333acdbc270/99126214921.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_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 5472 bytes
SHA-256: 28cd4ca6006342788d29d47cdd95b0a1e96740a1ca73cbc5733622f22412816e
font_01_sfnt_off00010113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 17480 bytes
SHA-256: b25d32bc4c6834e7eb25c2fbff218698e101abca9962b8554ad961b9de595425