Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f679bc77ca09cb7…

MALICIOUS

PDF

84.4 KB Created: 2021-03-12 07:49:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7c3f78ecd13352a400f3e95b1b4955ac SHA-1: 9752cc73edda079ce3843f6fd258ffddd523dc22 SHA-256: 3f679bc77ca09cb76e0fe0a85b2664d3575f9f98199c2fb99a98142213d8e1d5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9954

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://vilenefex.ru/wix?keyword=the+lake+lyrics+edgar+allan+poe PDF link annotation
    • http://paxezot.getenjoyment.net/zutimefajufafudopek.pdfIn PDF document text
    • http://zemesod.getenjoyment.net/11581249618.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/power_cooker_pressure_cooker_accessories.pdfIn PDF document text
    • http://kobazugipodiv.medianewsonline.com/36207354960.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/baxadelefofibuz/introduo__anlise_envoltria_de_dados.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf4dc8a-d776-4715-b045-496c87e91d48/sujedasigikemitogotugun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40fbb4ab-130d-4948-aa11-3f8ba1b3f54d/falling_upward.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/125ca9f2-32c5-45ef-a2fb-c0795882c3e6/jofezozuzevudatigebumof.pdfIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_6cd3e4c12cec4efaa85f5d9971a18fb9.pdf?index=trueIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_0d315e78619a48b9a117bc46a79ed69b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luxelula/vugododemov.pdfIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_ad145e4f7c60401a816836c62d76d99b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc28ee4f-d885-4bee-bea6-794550f30bb9/how_to_approach_conflict_resolution_in_a_relationship.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1210354-d050-4591-a8c1-30b2b9c7fe84/toro_824_snowblower_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2283dcb6-f172-40d0-a02e-2d2ef521ec4a/does_samsung_replace_screens.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/driver_blacks_law_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/ligidux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1843fd0-e8a3-49f1-8abd-1d604354fb2a/52513761506.pdfIn PDF document text
    • http://pikaderobiw.atwebpages.com/fanuc_programming_software_free_download.pdfIn PDF document text
    • http://vamavaremimot.atwebpages.com/47652095798.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/how_to_expand_binomial_theorem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b6a165-5069-40fd-9178-a0b63f77de23/road_to_hana_tips.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/kung_fu_panda_3_netflix_usa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/746179fc-8aac-4bb0-a968-f7de1d964fe4/22989474018.pdfIn PDF document text
    • http://jigisasamupor.onlinewebshop.net/3699788733.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/an_expensive_food_94_answers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 5448 bytes
SHA-256: 9e4ff448a4156eb9501e2cc4769feda6c298f2821257e16acb4ec8ff4a81ca34
font_01_sfnt_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 10252 bytes
SHA-256: 8382f0a07bba8f305b5f81e1ba2a0a28df0edaaaee4907f4f6df9628faf25bdc
font_02_sfnt_off00012db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB2 16236 bytes
SHA-256: 7966f83035635729f148b379455cf3006b8c733a21c6a3dfbec2391bbefa5716