Malicious PDF — malware analysis report

Static analysis result for SHA-256 0386e6271fcb0bbe…

MALICIOUS

PDF

93.0 KB Created: 2021-03-01 11:46:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 210ecb1225c8310513ec12fa88ce9523 SHA-1: bdf7e27c4fffa3d356086c46d483e38b5937bbe4 SHA-256: 0386e6271fcb0bbe4b8bc429153af651056bf721d93a5bfd1bb397499db50789
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to seemingly random PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a mass external PDF link farm, with one URL pointing to a potential malware payload. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=modo+de+transporte+terrestre+ventajas+y+desventajas PDF link annotation
    • https://rusaxexuratibu.weebly.com/uploads/1/3/2/6/132680860/7447818.pdfIn PDF document text
    • https://pimelitapata.weebly.com/uploads/1/3/1/4/131454500/7087469.pdfIn PDF document text
    • https://fajimidisuwa.weebly.com/uploads/1/3/1/6/131606183/1640925.pdfIn PDF document text
    • https://dipediras.weebly.com/uploads/1/3/0/7/130739778/sasedomemaxigazewore.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/agile_methodology_scrum_definition.pdfIn PDF document text
    • https://muwewixobajigu.weebly.com/uploads/1/3/4/3/134312624/jigiwirumegojudoriwe.pdfIn PDF document text
    • https://mofalapew.weebly.com/uploads/1/3/4/3/134307760/kidezubi.pdfIn PDF document text
    • https://rukusipaxup.weebly.com/uploads/1/3/2/6/132683367/zizofakenabib.pdfIn PDF document text
    • http://netusikofigo.22web.org/vebimavenazulakumoresut.pdfIn PDF document text
    • https://mezepobavufu.weebly.com/uploads/1/3/4/7/134717124/1959224.pdfIn PDF document text
    • https://gifivetusox.weebly.com/uploads/1/3/4/7/134736849/27523.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/remeranexe/family_calliphoridae.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/source_sans_pro_adobe.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/year_3_money_worksheets_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/arial_greek_bold_font.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/59657239450.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_off00012c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C00 5164 bytes
SHA-256: d56414079d46078ef0f7fe42ce9f6c55836d7cc6faa29a95225cda8c20b2db97
font_01_sfnt_off00013dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBE 12064 bytes
SHA-256: 9ddc0789d527e94b465da1915e14d3f21a242c52f3b5c764d3f12e232d41e783

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