Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a917a85eb895a1…

MALICIOUS

PDF

79.7 KB Created: 2021-03-10 08:03:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 68ab217486316e58cb67e476446112ef SHA-1: ba6ad44a73dcf1a3e3a53b160ad9a9c55617e868 SHA-256: 19a917a85eb895a1cf63d07204a98af85e692b85b0dbae79e18da7096ba92a94
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, with heuristics indicating that some of these links lead to known malicious redirector infrastructure. The document body contains obfuscated text and metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents. The primary attack vector appears to be luring users to malicious websites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=isabela+zip+code In PDF document text
    • http://supobesopo.mygamesonline.org/biology_class_11th_ncert_book.pdfIn PDF document text
    • http://dapurixid.sportsontheweb.net/7959920691.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/walaxovugulonitebeluwaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_582b77f887dc43cc90785653f5ac7f1a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21cfec29-c6e5-4435-801f-9aefd8112e68/fotoxubamakawosej.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/lexemogevewurimob.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/woniwusavakotet.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/badlapur_songs_wapking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/695c5d06-af4d-4345-8e33-a7f666b0aea9/54376156348.pdfIn PDF document text
    • http://razafif.epizy.com/baralimezurilesuteton.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/identity_function_worksheet.pdfIn PDF document text
    • http://jegagasare.rf.gd/karcher_k7_pressure_washer_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/how_to_fix_a_seized_lawnmower_engine_no_oil.pdfIn PDF document text
    • http://rejoxudirux.epizy.com/7241600877.pdfIn PDF document text
    • https://6c639bf1-704a-4500-b661-329758898742.filesusr.com/ugd/02d620_da98d3f288b64daa95ca34f6894b7da0.pdf?index=trueIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_31e7c9263d2e4340af624da5aa4ec0fd.pdf?index=trueIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_2f2a8df470384e13aff4896dc263be46.pdf?index=trueIn PDF document text
    • http://fojakosi.atwebpages.com/nixon_player_watch_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6db05d3d-82d7-4e15-89cb-ada8a3303116/best_gluten_free_bread_maker_recipe_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e98a08b-f022-41ff-b81d-1c503c9db4c9/foreign_service_officer_test_passing_score.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/545293f8-cb51-48a4-8d3e-d1fd84105277/libro_evidencia_que_exige_un_veredicto_josh_mcdowell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75f268e5-ff0a-4570-b44e-0324a7752443/24531505221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/212ba98a-5b64-469a-9c51-a49fac2ba657/brandsmart_tv_mount.pdfIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_5b3cbf3b772c43178d6b7c24cd50a921.pdf?index=trueIn PDF document text
    • http://fidikaxano.myartsonline.com/dell_1704fpt_monitor.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 4700 bytes
SHA-256: 3a6659be19e6a7cecc3b6235e7b579dffe303b60fa023f4fcb80717b32891e18
font_01_sfnt_off0000ffc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC3 10428 bytes
SHA-256: ab9faefd96d541aa246e13efca16b84c01335f21091906197cc7a6a5eb8adb59
font_02_sfnt_off0001236a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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