Malicious PDF — malware analysis report

Static analysis result for SHA-256 97706ec57841151f…

MALICIOUS

PDF

77.1 KB Created: 2021-03-31 05:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0443d115432cb024ffbdae4988afc3b0 SHA-1: ec288806d21c60b035f6c6087869520a8aa68fca SHA-256: 97706ec57841151fc5cb011215985d3c5f8c2e4dcbc5566277d8826fba244754
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of links to external PDFs hosted on disposable domains, suggesting a link farm or SEO manipulation scheme. The ML classifier and ClamAV also strongly indicated maliciousness.

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
  • 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://crophysi.ru/strik?utm_term=how+to+program+m-audio+oxygen+49 In PDF document text
    • https://kemewekodu.weebly.com/uploads/1/3/1/8/131857474/0f9cdd5672.pdfIn PDF document text
    • https://selasemo.weebly.com/uploads/1/3/4/3/134320140/022861daf36.pdfIn PDF document text
    • https://cdn.sqhk.co/fezavomol/kURigqb/cell_world_denton_tx.pdfIn PDF document text
    • https://gofasajuv.weebly.com/uploads/1/3/4/3/134359632/witiletuxijanege.pdfIn PDF document text
    • http://fejavodexata.getenjoyment.net/sizilesebataxofasezokox.pdfIn PDF document text
    • https://fupevigojajoma.weebly.com/uploads/1/3/0/7/130738700/5813131.pdfIn PDF document text
    • https://cdn.sqhk.co/fivukidado/hgeXCid/best_bass_boosted_spotify.pdfIn PDF document text
    • https://cdn.sqhk.co/guvelebul/fjaQusG/dino_safari_2_poacher_pursuit_3d.pdfIn PDF document text
    • https://sexanugujox.weebly.com/uploads/1/3/4/2/134266496/nufufa.pdfIn PDF document text
    • https://zalatedaduliwa.weebly.com/uploads/1/3/4/8/134881590/xojixadalukuw.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/73245484169.pdfIn PDF document text
    • https://modatubegawaso.weebly.com/uploads/1/3/4/4/134491319/7303427.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_aa88b5cb5c03417fb6c638ef9d625b5c.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_1e1a77d539ea4a18b576531e82b92709.pdf?index=trueIn PDF document text
    • http://naburonip.myartsonline.com/vituxidonorelu.pdfIn PDF document text
    • http://dazejifudora.onlinewebshop.net/69166027030.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_off0000ee0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0F 5568 bytes
SHA-256: 1e43b9ee20ff36008f30a81ede1a139744aec880b82f6627c3a638e0f6efc4d1
font_01_sfnt_off0001011c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011C 11284 bytes
SHA-256: bcd3428c1afcc6269221c1e169f9467518b8876e3c80f4d192748ecab65551b4

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