Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31515846be0d84f…

MALICIOUS

PDF

75.8 KB Created: 2021-04-02 17:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 619d9ff49b09debfb8ea453e47563712 SHA-1: 9c027d9127864ea72f052c885ca54d227b8926ff SHA-256: d31515846be0d84f580a6894865ddc78fba1d615d896a3a4277303aac1f6b9ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal it contains a mass of external links, suggesting a link farm or SEO poisoning tactic. One of the embedded URLs, 'https://resalured.ru/strik?utm_term=why+is+prioritization+and+delegation+important+in+nursing', is directly associated with the malicious classification. The document body, though heavily obfuscated, contains text related to prioritization and delegation in nursing, likely a lure.

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 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.
  • 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://resalured.ru/strik?utm_term=why+is+prioritization+and+delegation+important+in+nursing PDF link annotation
    • http://shtangye.xyz/bovikiljbu.pdfIn PDF document text
    • http://store50off.info/panasonic_lumix_fz2000_testc5a5w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453560/normal_60458f0fea285.pdfIn PDF document text
    • http://yourlivehelp.com/sokukimaduwev81je1.pdfIn PDF document text
    • http://fridgeservice.ru/bowikepegig103bh.pdfIn PDF document text
    • http://arthromedro.xyz/wisugiwozus64p0y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448551/normal_60579f02afeea.pdfIn PDF document text
    • https://fofawuparojimi.weebly.com/uploads/1/3/1/0/131070926/rojezir.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/00d8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480423/normal_6007e7c41e899.pdfIn PDF document text
    • https://kenibojowosude.weebly.com/uploads/1/3/5/3/135324683/1640161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459175/normal_60258e368b117.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454694/normal_604b8cbb7ed2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490934/normal_605d3f654ceb0.pdfIn PDF document text
    • https://bigifami.weebly.com/uploads/1/3/1/4/131407708/9548424.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/bejawada_audio_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/sirebidakotexugas.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/blaze_pizza_franchise_information.pdfIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_d20c453563be4e0c939e9412e3bcff83.pdf?index=trueIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_63dadad6030346c3b8b7bed52b5aaeef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juvosi/speechless_piano_sheet_music_lady_gaga.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/chore_list_template_excel.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_off0000eafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFB 5536 bytes
SHA-256: 57a3fcc3ea4819e250198587ac5a72467ff1a8224482461f229604b0838ddac2
font_01_sfnt_off0000fdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 10456 bytes
SHA-256: d20700c751a6ec8357c117bc2df1b956ea1fc2224a4812a6c209093323c57b47

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