Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9ab30adefe62eb…

MALICIOUS

PDF

77.2 KB Created: 2021-04-22 04:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c4807c52395c26da2fc5a0d9fd1db42b SHA-1: 8f55ac5c7c3cf5ddb64b922cbf2e04ca489a4600 SHA-256: 0b9ab30adefe62eb69d42a06ea6ea05cfd64cc8f58c145546b263bb471074aa1
66 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 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 0.9997

Heuristics 4

  • 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://vilenefex.ru/strik?utm_term=chi+health+center+omaha+hotels PDF link annotation
    • https://cdn.sqhk.co/fovomesit/bTuieAR/dancing_ballerina_ballet_dress_up_fashion_show.pdfIn PDF document text
    • https://cdn.sqhk.co/satijumok/e9ibicU/vagodazapivekikafez.pdfIn PDF document text
    • http://fusubakitakudup.66ghz.com/antminer_s9_troubleshooting_guide.pdfIn PDF document text
    • http://ganoget.scienceontheweb.net/hey_soul_sister_partitura_piano.pdfIn PDF document text
    • http://jixazepo.mywebcommunity.org/animals_worksheet_for_grade_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449783/normal_6069154276b23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476148/normal_603430ffc1bb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484363/normal_60315f694f4c7.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/9fe31d65-5df2-4c0b-ac97-080ba1ac3bf5/1993_polaris_trail_boss_250_parts_diagram.pdfIn PDF document text
    • http://mugazukadum.onlinewebshop.net/lawadur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbdb6ee2-c4fb-4115-bc22-0189ce5e787a/zifeguvigix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b3f77c-ca44-413c-8170-3ae5c25b68cb/11437162796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e7b5f02-d01b-4b5d-8f5d-ae7ed51cfeb0/how_to_clean_a_dyson_battery_vacuum.pdfIn PDF document text
    • http://tugupora.epizy.com/42344936228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e54d848e-f771-47f9-8f42-164955a73f23/shure_ulx_g3_receiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffda9f3c-3ede-449c-81d5-cf795d6e82b1/wapikifazig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d056739e-b818-4734-8e8e-99b7642bc3a4/78817956174.pdfIn PDF document text
    • http://fepavipa.epizy.com/susolefamivijuneweweruna.pdfIn PDF document text
    • http://nuvezutonotogev.epizy.com/is_sony_xplod_subs_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/870ec9bc-4861-4796-b5e6-ca931f4033d9/limezafopifosimegax.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_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 4944 bytes
SHA-256: 8e32235bae2af763e5fb3d28a48444424d99f7114d0e2ab441e085ac7f297184
font_01_sfnt_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 11072 bytes
SHA-256: 7b1d5a2785290fa8f118781a4ecac456098965959da28b863af7836812233a90

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