Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b895f95af0c37dc…

MALICIOUS

PDF

79.0 KB Created: 2021-04-06 11:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f9b2cea27cf7631b8820903efa7cc556 SHA-1: 021961d945ec7bc2a0f560fbcb6566e82025e9b8 SHA-256: 4b895f95af0c37dc82a1c40ec7b38fa49d4edf27462921c5f97107aa4b63970e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'jacksth.ru', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of hosting malicious content on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=when+technology+fails+pdf PDF link annotation
    • http://basumoxivor.sportsontheweb.net/agricultural_systems_of_the_world.pdfIn PDF document text
    • http://table-wait.com/26891791795abzo8.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/13819256670.pdfIn PDF document text
    • http://help-nanny.site/678698668450zy99.pdfIn PDF document text
    • http://itfamily.info/destiny_2_raid_guide_last_wishrzkct.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/53853917441.pdfIn PDF document text
    • http://jijoxep.getenjoyment.net/58438781374.pdfIn PDF document text
    • http://dupuladusudired.mypressonline.com/quantitative_aptitude_test_free.pdfIn PDF document text
    • http://kutejovanog.getenjoyment.net/manual_de_auriculoterapia_acupuntura_auricular_francesa_e_chinesa.pdfIn PDF document text
    • http://ladunosim.sportsontheweb.net/gavira.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_9fed68c2e20a417eaaea549cb974bbcc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c50ed64-ebb0-4588-b905-23449b6039a2/que_es_una_propuesta_pedagogica_ejemplos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/380187c5-a4e8-4d6a-8d94-ba25fbc5debd/lifetime_health_textbook_answers_chapter_6.pdfIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_cf7ae17e143a4ffaaee9d0d747942bda.pdf?index=trueIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_3fd0da6c1b4943f6bd1e746978444105.pdf?index=trueIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_d93762d38e2f46a889ed083bf1a13739.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/005aa463-82cc-4817-b479-827078e2f3f8/4241637583.pdfIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_43376bd7f74a488aab5af890f5295757.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_0f40a1c3e0914118911f85299ef5903b.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_off0000f630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 5436 bytes
SHA-256: 1063521749b56fdc6ceb2120c6cb2e172b1398fb51ddf830f0fab048cddf5f79
font_01_sfnt_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 11156 bytes
SHA-256: 6033b0b5749bb6a791e9aae7e5d358c44211b538b1c37d75c030cb398990160e

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