Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf946bcd0a51c17…

MALICIOUS

PDF

78.5 KB Created: 2021-06-09 22:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 98839ecc551b99db346f6e8c3c799b9c SHA-1: a152541337e815f368d21d8f62534db45ccbb2f0 SHA-256: fdf946bcd0a51c17b090f8f97e22db96cded6740b9ccfb20dcdbd9fd92b4c6ad
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 0.9993

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://queure.ru/pbw?utm_term=cuentos+grotescos+de+jose+rafael+pocaterra+pdf PDF link annotation
    • https://wanitovamuk.weebly.com/uploads/1/3/5/3/135303456/jinakobikuni.pdfIn PDF document text
    • https://veguxalefimas.weebly.com/uploads/1/3/1/3/131382166/jeketem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500001/normal_5fedff8286e39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460471/normal_603249c7501ae.pdfIn PDF document text
    • https://babunugigexi.weebly.com/uploads/1/3/4/5/134582988/012b67de.pdfIn PDF document text
    • https://zepagowixo.weebly.com/uploads/1/3/4/8/134887299/lupugal_womukorikuv_vafedo_zobudulonegefik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376380/normal_5fc70175e1072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_6056144c990de.pdfIn PDF document text
    • https://dutigopomifit.weebly.com/uploads/1/3/4/6/134611267/3466982.pdfIn PDF document text
    • https://zoredufuno.weebly.com/uploads/1/3/4/6/134638801/3452447.pdfIn PDF document text
    • https://zanebereraba.weebly.com/uploads/1/3/4/4/134472179/2426785c.pdfIn PDF document text
    • https://tivofemexire.weebly.com/uploads/1/3/4/0/134012880/lisikuvodusudof_netalivuziduwo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407314/normal_5ffe2b0693298.pdfIn PDF document text
    • https://gawejewigedek.weebly.com/uploads/1/3/2/7/132741035/1250219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485689/normal_602988f16720f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446634/normal_604ebda7ca30a.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/ea8b3b2d-6de0-4e23-be81-f7a1bc6bad09/zaposulajo.pdfIn PDF document text
    • http://povelin.pbworks.com/w/file/fetch/144663180/understanding_human_sexuality_14th_edition_free_download.pdfIn PDF document text
    • http://labidan.pbworks.com/f/how_to_make_a_million_dollars_in_real_estate_book.pdfIn PDF document text
    • http://febamizilaw.pbworks.com/f/tongue_twister_poems.pdfIn PDF document text
    • http://vomuseteweto.pbworks.com/f/zig_ziglar_secrets_of_closing_the_sale_barnes_and_noble.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6f1eb7-43cc-48f7-b7e4-637d30f16637/zovetuxunet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78756975-b3ac-4dbb-b55a-ded0ec3e27ac/32990905051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c431ff2-4739-43ba-be98-1659c5fc52fd/what_to_say_to_zen_mystic_messenger.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_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 5304 bytes
SHA-256: 17aba9a3983194d88e36512d054366a38c7cb4512540a54b8abc527559c9ae18
font_01_sfnt_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 12020 bytes
SHA-256: afb5172ea1f55bd4656da55d45d6762a6355cb88301b178b7e7aaef284a25f37