Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78dc62e8b845346…

MALICIOUS

PDF

105.9 KB Created: 2021-03-29 22:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6a73fea30a7e38eb26504dd15520cb57 SHA-1: 30399d8d11ae93b1a822953dfec2e52a409f62f1 SHA-256: a78dc62e8b84534687fd80e5ff9ea333032ad016b2fce9968498cc24de00df5f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The embedded URL, 'https://midufefew.ru/award?keyword=weekly+calendar+pdf', is likely part of a phishing lure, attempting to trick users into believing it's a legitimate document. The PDF structure and heuristics suggest it's designed to exploit users through social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/award?keyword=weekly+calendar+pdf PDF link annotation
    • https://cdn.sqhk.co/rokogikapo/gdbygfc/adidas_slides_adilette_comfort.pdfIn PDF document text
    • https://cdn.sqhk.co/sirijunubi/jjsiNia/nigalafesejabepoxadilug.pdfIn PDF document text
    • http://jobs-ingenieur.best/80500039168atcn0.pdfIn PDF document text
    • http://deromgroup.com/apple_ipod_nano_7th_generation_reset0lczm.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/749741e5-fd84-441a-9d9c-61488daefc30/56674760585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c069bf1d-b42e-4138-ba68-f7f8297bccbf/wolfgang_puck_pressure_oven_dimensions.pdfIn PDF document text
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_b9f143b6cdf24ba2a7bf84d5ad6aef9e.pdf?index=trueIn PDF document text
    • http://xonizud.epizy.com/puvobozeza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e24bd255-23ca-4870-9452-64912a6698b3/segef.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_aa6ecaa73b0e4861b551626f9e1595b3.pdf?index=trueIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_36e935cb11764371b03abe83a5178d36.pdf?index=trueIn PDF document text
    • http://tituvuten.rf.gd/carl_sagan_pale_blue_dot_photo.pdfIn PDF document text
    • http://kilarosine.atwebpages.com/biochemical_engineering_fundamentals_2nd_edition.pdfIn PDF document text
    • http://vilatelisoto.onlinewebshop.net/nizilirisunuxamotu.pdfIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_3f699b5c3a344734a4d3e58df62842c1.pdf?index=trueIn PDF document text
    • http://jutejuviwolopis.rf.gd/android_10_update_pixel_3_issues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9243e8f-0d0c-44c1-bfc4-8029d4225e36/58802023933.pdfIn PDF document text
    • http://gajamozaxekega.atwebpages.com/booky_wook.pdfIn PDF document text
    • http://timavutiziv.epizy.com/91720590099.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_b9480bd710b94152adc3cd378a304e7c.pdf?index=trueIn 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_off000160ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160EA 5148 bytes
SHA-256: 270fd2ea073d92ef92addf3e491387af7ab570bf39d31e373c9ab4994f42070b
font_01_sfnt_off0001729d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1729D 11408 bytes
SHA-256: 705e39f009dc2401dce71d946240028aa5afdb1724b5c36916b866c6b102b0a4

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