Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b15990257d24df…

MALICIOUS

PDF

76.6 KB Created: 2021-06-06 15:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 523d3015d4b247e517e7dd6077d3c930 SHA-1: efa4fc84fb98acd20379dde9f50a1958ffc69592 SHA-256: a1b15990257d24df4b3cbc8595417bb30130349328d14f36c727ab9e49e8d440
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 0.9998

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://pistant.ru/pbw?utm_term=how+do+i+make+my+voice+deeper+permanently PDF link annotation
    • https://fadetelipivike.weebly.com/uploads/1/3/4/5/134523249/d68c5c34274e.pdfIn PDF document text
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/mekadawafiloz_fidurofaru.pdfIn PDF document text
    • https://waponalafax.weebly.com/uploads/1/3/4/5/134529016/7bf351c.pdfIn PDF document text
    • https://detudonerud.weebly.com/uploads/1/3/4/6/134660859/9682657.pdfIn PDF document text
    • https://xanowiporak.weebly.com/uploads/1/3/0/8/130814060/menatopepepafimu.pdfIn PDF document text
    • https://sagezawi.weebly.com/uploads/1/3/4/3/134322896/mukedi.pdfIn PDF document text
    • https://xusukimijep.weebly.com/uploads/1/3/2/6/132681495/3268955.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3c57d7-c50d-4ce5-acf7-ba3801e2f50b/34459005395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb71f316-3bbe-45b0-9e0f-b8ec4d947e21/coach_coach_quilted_leather_belt_bag_-_black.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a4bdc7-4cb3-4f47-8fb2-12f85ecf1c51/samsung_galaxy_note_4_flip_cover_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4a82a4-6bff-4167-9494-a5f963bef5b3/how_much_do_kohls_pay_an_hour.pdfIn PDF document text
    • http://pebenuziwi.pbworks.com/w/file/fetch/144583254/ejemplos_de_ejercicios_de_fuerza_absoluta_y_relativa.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/f/64798681068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36acb8be-de1f-4dfd-aefc-3ead421050aa/cuisinart_custom_14-cup_food_processor_accessories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4885ed46-3da5-4222-bca5-05eab2b1dcd9/11429988213.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/f/el_cerebro_humano_libro_de_trabajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1cccb1c-9f11-4b93-a79d-617ac3ad7ea5/zuviwinugupew.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/w/file/fetch/144598593/adverbs_worksheet_grade_2.pdfIn PDF document text
    • http://didaneguk.pbworks.com/w/file/fetch/144427905/jagotekuwidixaza.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_off0000efd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 5320 bytes
SHA-256: 2225d5ada76b859c08768dbd49e0a9364bf9d9f151f5e3308d6e2b540c0e8c2b
font_01_sfnt_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 10336 bytes
SHA-256: ca5cce611af35c0e7db994f5a6a8c3f936c76b68ea1f6595074d9e9a95175fd5