Malicious PDF — malware analysis report

Static analysis result for SHA-256 128ea3254dc4457b…

MALICIOUS

PDF

74.2 KB Created: 2021-02-22 07:56:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 219736c9f61979fc1368159db204eb62 SHA-1: 31bc4f735940e2fb403f87d742e5343396976236 SHA-256: 128ea3254dc4457b463cfa2163ef152fa02e72fdda8a9c15b73d644d63c7ae57
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link and a link farm, indicating an attempt to direct users to harmful websites. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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/123?utm_term=an+inspector+calls+trailer+aisling+walsh In PDF document text
    • https://sefokuto.weebly.com/uploads/1/3/0/7/130738721/karoduwiwed_lalurezofave_kufivitok_wefufe.pdfIn PDF document text
    • http://bazis-rostov.com/libro_beloved_en_espaolyi9xn.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/h2Dgh4w/nixem.pdfIn PDF document text
    • https://sarotokatot.weebly.com/uploads/1/3/2/6/132682281/5182027.pdfIn PDF document text
    • https://sivubatololux.weebly.com/uploads/1/3/4/8/134850937/6e5fc8b950a60d.pdfIn PDF document text
    • http://meblik.su/mufamutereralakogumoxw6pa.pdfIn PDF document text
    • https://mutabezikubi.weebly.com/uploads/1/3/4/7/134739743/sebaju_jakefuz.pdfIn PDF document text
    • http://itprod.space/daleretifokeduxv9kql.pdfIn PDF document text
    • http://my-credit.info/bawoxoviwarujopedeirb5.pdfIn PDF document text
    • http://mif-smeh.space/plantillas_de_cajas_de_navidad_paraivyg6.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/fobupojowojon/bugixogakuka.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/41005106029.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/clickshare_cs-_100_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/rukapevosa.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/manual_auger_post_hole_digger.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/diablo_2_remastered_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/44515739875.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_off0000e377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 5276 bytes
SHA-256: 057b63cd77c19825f1a8be6e516ff55be49f80bfd6bd4834985fd35374329345
font_01_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 11184 bytes
SHA-256: bfe7be303a0d33e3b762e35632dffb34cb27f3056571e63810663b0b86aab465

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