Malicious PDF — malware analysis report

Static analysis result for SHA-256 472a1cfbbce3cd51…

MALICIOUS

PDF

103.8 KB Created: 2021-06-01 00:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 31b650e07b85e644540efbd20d4549f4 SHA-1: 27f467b4627cc25d0913179810ae27ff2e1386c7 SHA-256: 472a1cfbbce3cd510cb4e43b982c3df7a8818d0d8cca59606ecb66ced91a2aa7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to link farms and disposable hosting, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://archism.ru/pbw?utm_term=what+is+dimensioning+in+technical+drawing PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402722/normal_5ff8c80cc8d0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372104/normal_60015e65f0204.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144428136/73866048780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a5d94f-77e3-4ce3-bb7a-313414a7538c/kirodati.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144428370/kowofogorixuxakem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f516fd5-5ed7-44f3-a518-c4a7062cb3b1/95262177164.pdfIn PDF document text
    • http://ruwezebom.pbworks.com/w/file/fetch/144425034/54536179183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3488a5f-dd38-4fb3-84cc-eb4b57d0c3f7/58720229255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d3a9347-bdae-4934-8f14-7f6469c1c98a/xofunaxaredat.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/f/85327312290.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144420741/exercicios_termos_integrantes_da_orao.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed641b1-273a-4b1b-878b-29c98506729f/konica_minolta_bizhub_c224e_toner_wechseln.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89f76d30-064a-49b1-a44a-f2ef720c5559/how_to_play_settlers_of_catan_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32e36aeb-2f0a-4c6a-858a-d40dfc5134ba/how_to_bomb_jump_in_botw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f46ace1d-7a82-42f9-8a8f-aec8fce5b8a9/38517354238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3625fea7-a26a-4d0a-bb73-0d4a26b22033/gabumufasosumefo.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/f/how_to_get_axes_in_lumber_tycoon_2_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64ae6c19-d40e-4c73-a7f8-78fa2376bb7f/how_to_inspect_gas_furnace_heat_exchanger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9a04290-6cb4-43dc-9cf3-bb3a0201e881/dufatafesuwerulumo.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144419103/vagebaxixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4100f61f-cbc0-42cb-8d4b-a7b818825214/9271602566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e8d0afe-f5d1-4ded-824b-f2108d2f24b4/22522384052.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_off0001584c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1584C 5460 bytes
SHA-256: 92c6a6a4fa8cac8fb794f3c783130d9bb7462d8ac37aa0c02f9f9742fe432d5a
font_01_sfnt_off00016ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AC4 11372 bytes
SHA-256: c4f61fdbf0752be97e7b2a385f454494ecf40c8ca8ffc77ab6813fd9d420e1be