Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1ca25e5eb7babb…

MALICIOUS

PDF

89.3 KB Created: 2021-03-07 03:23:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 02efab7ac501fb52660d7b3290707b58 SHA-1: 9e83620afcd1b6fd8671230876e1e0b7be71ca07 SHA-256: ec1ca25e5eb7babb6bc5273845df91773018e56d06c2839db8e6bca59a58f7c0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, which is characteristic of a link farm used for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://bologen.ru/wix?keyword=spanish+2+chapter+6+test+answers PDF link annotation
    • http://zeboxagekej.sportsontheweb.net/9763686273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447437/normal_5fd0e2375f5ec.pdfIn PDF document text
    • http://tedurelaseji.mygamesonline.org/vifoxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418755/normal_5fdb15bcda5ab.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/harry_potter_collection_books_used.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420767/normal_5feffe74f333c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nimanexobubibub.onlinewebshop.net/gutuwofasanemubu.pdfIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_27d14803957f4ac59789cd77de632a92.pdf?index=trueIn PDF document text
    • http://gajutar.onlinewebshop.net/levit.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_28643e4dd6e4432bb8052a6f23c6d8d3.pdf?index=trueIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_8edb522a872643dd9ee4dabfa6e6e8e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a3cd52-aa87-4d99-8053-ddcf3ac07e4d/variador_yaskawa_v1000_manual_espaol.pdfIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_d7f98fe2eeee41b1bc43d128f07b42f2.pdf?index=trueIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_ed8e7d7667b74e7fbe6cadae52ae0209.pdf?index=trueIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_d77336d2ae654f32bd0fe7e5dc3e9923.pdf?index=trueIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_0366d633709b4b08a599c562a1c1c056.pdf?index=trueIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_956b88d96aa74ea388df407547046fa8.pdf?index=trueIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_e3583eb8e55643739b18654c75680244.pdf?index=trueIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_708688932c85446e97890abd41b627d5.pdf?index=trueIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_f5bc0101154147c582e2490b164072d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e092d872-f43a-4c22-8986-fa9b409bc9a3/dyson_v7_absolute_user_manual.pdfIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_6fc36cce8ede4b34b5836537de61aad9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/70abd142-6f50-4831-ad8f-048303f22f6a/what_is_jojo_part_7.pdfIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_483e3f8d051e4ce4971ea6233db7a1e1.pdf?index=trueIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_fb0a0d2e6fa44a9f974bb3681290c26a.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_off0001147f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147F 5468 bytes
SHA-256: a6dfca8aefd808d75152cc5873403643de5941589545d20ad659019d0aae98de
font_01_sfnt_off00012724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12724 15760 bytes
SHA-256: c3f95b8e482f2e4bd79ac2045aa4b890189528575f2492198b96f7b0002ab595

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