Malicious PDF — malware analysis report

Static analysis result for SHA-256 183ef203100b4f28…

MALICIOUS

PDF

79.7 KB Created: 2021-03-13 15:19:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 818a8e72f55a82458247867970b88689 SHA-1: 28967fed3f42460c73f8fcae9bbc7414bf67387d SHA-256: 183ef203100b4f2896761463633cda1fa9cbe17c02e68aa1ae84285e9b336627
76 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, identified as a potential phishing or malware distribution lure. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URI heuristic indicate an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/strik?utm_term=what+are+the+professional+standards+for+teachers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380700/normal_601171e15119f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419836/normal_5feceef8e558c.pdfIn PDF document text
    • http://koteyarn.moscow/football_manager_touch_2018_mod_apkl5upe.pdfIn PDF document text
    • http://yyyyyyhhhhh.space/ge_cafe_gas_stove_3648mxk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427504/normal_60415549f2dfa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385647/normal_5ff685a750ed3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409114/normal_5fe5a199020bc.pdfIn PDF document text
    • http://fringigejy.site/87102971060kn46r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_601a45169ad6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/anti_slavery_policy_template_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2da89559-db90-44fc-b071-a3de5f7ca1b8/barrington_hills_observer.pdfIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_f859d4be117d46148b76ae2785af033d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/loguwoxebevakuliziparofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0408719-8b03-4aed-8a80-0960cc723ab6/vuzotujite.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/borghild_dahl_i_wanted_to_see.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/nice_guidelines_menopause_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8291ce42-11bd-46d5-b839-ecd52ae6e429/1948924691.pdfIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_d1f9354f8acc4a3a826027acbff516d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisazabe/15489837537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a099bc19-b9e7-42ca-8177-6e8fc3d7169e/dobatamapofiwogiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c6498d-eef1-4bdd-89a9-3a1d08115566/zekubewawutujijunox.pdfIn PDF document text
    • https://2ea3657d-1c4c-40dd-8491-58aeeb8dc933.filesusr.com/ugd/18a85a_33af301be81f4b41b53d2c79f4f608ec.pdf?index=trueIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_1237449606e44e91982450d1b9826794.pdf?index=trueIn 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_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 5256 bytes
SHA-256: b4890a082d14e720cd48533a7a2af8199b4aed64a550920792aa842837adc033
font_01_sfnt_off00010f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 9836 bytes
SHA-256: d1ec6c849e8dadd27d8bcb9621a7ac97383c141cf6bd65db7810d27c99b13d4c