Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7d5e1d655d0cc5…

MALICIOUS

PDF

78.8 KB Created: 2021-03-06 03:42:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3a91739cda86185212b68f2bd7d4006b SHA-1: 8d0a5e81be764a0d4b14476cc4ec8188da0a9701 SHA-256: dd7d5e1d655d0cc5e7bd66ea95a5ccb50469c5f445fd1616b60c982595433382
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 hosting services, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external URLs. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://jottigo.ru/strik?utm_term=how+to+write+a+vice+president+speech+for+student+council PDF link annotation
    • https://mexasazage.weebly.com/uploads/1/3/4/5/134513067/kebali.pdfIn PDF document text
    • https://poxesaxe.weebly.com/uploads/1/3/0/7/130738711/wisafisav.pdfIn PDF document text
    • http://kumululurug.scienceontheweb.net/how_do_i_report_my_ebt_card_lost_in_nc.pdfIn PDF document text
    • http://wuxetij.mypressonline.com/38970239472.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/38871833716.pdfIn PDF document text
    • https://pitatulepuz.weebly.com/uploads/1/3/2/3/132303378/3012564.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_b7a1ad499b9c460e83246ee352b511fe.pdf?index=trueIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_f608845ca05e4e7682f6c75001b57668.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae9b5ba1-5c8a-4e48-b9e1-2d7ff226714b/fitizunapodinirinuzibelog.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_26b7cba134c3478ca28f8f5270050c16.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7622b5d8-3514-459d-9126-660ba0605202/13928142815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad729ffe-50f9-4b45-a7ee-2a4f40e33840/rewinaruzakekefapo.pdfIn PDF document text
    • http://piwolimosopobu.myartsonline.com/el_nombre_del_viento_pelcula_2019.pdfIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_60d80b99a7ad4d60a31cc236506b736f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b16148ba-87bb-40f6-8c59-15bc5080303c/vedesofuxof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c07934d6-cfda-4b98-a99e-1d4bbdf2f0c9/feliz_navidad_movie_soundtrack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6653e402-0d4e-4cc4-bc64-e6fd48204db4/5186256690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46444e36-2acf-4eef-aca2-0ed1a45b24ef/yamaha_rx_v677_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a54203-1dbc-413d-9736-5a8054b506a7/moputafajatukuzaxokuxika.pdfIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_c6d238fd60bb4e4e8c77a0bd1a454fa3.pdf?index=trueIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_ae85f588ced843ffbd17733ecd64e090.pdf?index=trueIn PDF document text
    • http://gubadif.myartsonline.com/vocabulary_assessment_test.pdfIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_07da02b1e0bb4278acafd1bf76a8b5f4.pdf?index=trueIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_6dd6cc46c0e74ecaa6515885469a81a9.pdf?index=trueIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_f41277398f3346c1a00d925e0701ff7a.pdf?index=trueIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_370aa7cd87164b539156d9fcd583eecb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c77f6e3-2ef2-454b-9e44-5fbb03d7c99c/65052590947.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 5356 bytes
SHA-256: 3bae78f3122834ee452506d6062a0c411874d17e6694abcdcb79dcd9d143d2d2
font_01_sfnt_off000109ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 10320 bytes
SHA-256: f6c1df1e620c99e6a1664f5193a860cc06ca90db0fe2976d9da83b28358c7dc0

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