Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef153f81d6eab706…

MALICIOUS

PDF

74.3 KB Created: 2021-03-11 19:45:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f6a0dc87260d07473f711fb01dad3769 SHA-1: 15a363a89c919dc4e5386d87f0a0df8fac7f4091 SHA-256: ef153f81d6eab70680f996d36a5e1bd5bd2a6ef53b0d0078f232c7ec7ddff4fe
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, masquerading as a golf book download, which are designed to redirect users to malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'crophysi.ru' as malicious. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to be a lure for link clicking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=the+inner+game+of+golf+pdf+download In PDF document text
    • https://cdn.sqhk.co/mekaxosur/mQiigfK/31978232236.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/28642449646.pdfIn PDF document text
    • http://adanakebap.org/xijoxadetotefosadifebiesl.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/gjrihQy/xuxukuvotolema.pdfIn PDF document text
    • http://opros.xyz/750063944292mqji.pdfIn PDF document text
    • http://helpverifybadges.com/21603666540h6spl.pdfIn PDF document text
    • http://duzegotola.medianewsonline.com/42101730675.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/xupenadorapuniwavexolenib.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/TdhdicD/55897936007.pdfIn PDF document text
    • http://tublitalia.fun/85413434413z2rl3.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/donuzutagox.pdfIn PDF document text
    • https://jalizirut.weebly.com/uploads/1/3/5/3/135308553/kapidedu.pdfIn PDF document text
    • https://dogusomuribe.weebly.com/uploads/1/3/0/8/130814063/fujebekalefoxi.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/Dic3hgX/85985672502.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/937defc1-4a06-4713-a13c-33cbdd238365/engineering_materials_book_free_download.pdfIn PDF document text
    • http://ruvemad.myartsonline.com/algae_as_biofuel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d886a3c-936a-49a8-8e92-fa345ee20a93/is_my_samsung_tv_hdr_compatible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96ed7918-d883-4bcb-bf4a-a6b497483187/aps_payroll_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2407e0-93bb-4ce9-84bf-bac5d99b1f54/how_much_does_a_cook_at_chick_fil_a_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4698f456-00c9-4e43-8e08-375162666fab/is_green_tip_ammo_illegal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4315dad-172d-4f7b-920d-68891839b037/wuroj.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_off0000e727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE727 5320 bytes
SHA-256: 45cf0f27b2ff8ef3f7af05621c810ef041799f11b5af00f68363a114741caee5
font_01_sfnt_off0000f926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF926 10044 bytes
SHA-256: a9dc96217876274941d044d6653ce9c432ebc47598430cfed974a750f53c0373

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