Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bec3731bd25978…

MALICIOUS

PDF

92.8 KB Created: 2021-05-16 01:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4aa879418ab9cbefd9b9e37c0b328d15 SHA-1: 160111077899c340d21c0c815c8df5f9cc8a06d4 SHA-256: d4bec3731bd25978b9934acf97cf6f48dcc40779e10ae75cb199c73e6ac2f016
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains heuristics indicating it is a phishing lure and a link farm, with a high ML classifier score and ClamAV detection. It also includes an instruction to disable security software, which is a common tactic for malware. The document body, though heavily obfuscated, suggests a pretext related to 'airprint' troubleshooting to trick the user into a malicious interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://fokemale.ru/strik?utm_term=why+wont+my+airprint+work PDF link annotation
    • http://edapog.online/31358108984s2f4y.pdfIn PDF document text
    • https://muwamobole.weebly.com/uploads/1/3/4/3/134356931/pabepaweropizo.pdfIn PDF document text
    • https://tefojemitadu.weebly.com/uploads/1/3/1/6/131606809/buwevam_zujifi_vijufila_ravabuvi.pdfIn PDF document text
    • http://silvanozito.online/beginning_and_ending_sounds_worksheets-_1st_gradegpgdl.pdfIn PDF document text
    • http://tetiviguxawik.getenjoyment.net/22283433703.pdfIn PDF document text
    • http://pagebake.com/canon_mx459_printer_driver2cmcm.pdfIn PDF document text
    • http://youla-24.cc/zukotosawawifonajowuparipwhyg3.pdfIn PDF document text
    • http://rawiduti.medianewsonline.com/nursery_school_business_plan.pdfIn PDF document text
    • http://filanion.online/descargar_biblia_de_estudio_arcoirisye5ku.pdfIn PDF document text
    • https://popaxeras.weebly.com/uploads/1/3/0/8/130814769/6064447.pdfIn PDF document text
    • http://www.typoland.com/http://www.typoland.com/designers/Lukasz_Dziedzic/CopyrightIn PDF document text
    • http://www.typoland.com/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/42485467303.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/heather_sheet_music_piano_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/kuwufajevofet.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/pirenolobalegofe.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/arthur_conan_doyle_history_of_spiritualism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9af5091-656c-42c5-be16-75114f92cebf/54384292885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f142af-b070-42c0-8f97-c91b10fc0908/workplace_health_and_safety_course_melbourne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b578b35-dbef-4753-935d-0b725e8c767f/58833310727.pdfIn PDF document text
    • http://rojanesifilagu.myartsonline.com/code_name_verity_summary_part_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f096246e-384d-4bcb-a7d7-379d4a271782/zofifasiwet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15fab5e8-262a-4d92-b24d-e9693daa82cb/great_books_for_young_adults_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ddb61c3-e1f9-4e3c-b561-9a2f43f19385/gujonigajopedozuxes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c21116ef-27d2-4a49-a084-92a814f57752/91375110882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01bca217-095a-472f-af10-73829cb50351/is_your_capitalized_in_a_title_ap_style.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_off00011cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEA 6168 bytes
SHA-256: 50bd8db5ff9a0f03ea6ac0366ab4ff273dceb6ff0c6101ac0faff1fd52ccc92d
font_01_sfnt_off00012c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8C 5120 bytes
SHA-256: 4a5b0af9f84d5b923c03cac69959541ea04e6feaaca2eb3b7d7fddeeec84022f
font_02_sfnt_off00013de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE6 11164 bytes
SHA-256: 290e4de47e26342996bcfdc6b741e6c6047bb8c953b4a9223c920335cbcb57fa