Malicious PDF — malware analysis report

Static analysis result for SHA-256 861c2b0e3189cfd3…

MALICIOUS

PDF

77.6 KB Created: 2021-01-06 07:02:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d40e6cec4aa5a79bae563c5ab7024e00 SHA-1: dfb48db2983889d3ecb3c782adb2ecd630f42678 SHA-256: 861c2b0e3189cfd361ef14b9620a778aadb81f1427096cf5f2a6021681c8758e
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external links, suggesting an attempt to drive traffic to various sites. The ClamAV detection and ML classifier further support the malicious nature of the document, likely used as a lure for phishing or malware delivery.

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
  • 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://traffmen.ru/aws?utm_term=beacon+hill+school+uniform In PDF document text
    • https://kadekorik.weebly.com/uploads/1/3/1/4/131453454/7cb5dd9c2a15544.pdfIn PDF document text
    • https://sibotapitagota.weebly.com/uploads/1/3/4/3/134378411/suvujok-zelog-jizasam-bijamedifinonal.pdfIn PDF document text
    • https://waniremupamed.weebly.com/uploads/1/3/1/4/131407535/noxununaten_fubevif.pdfIn PDF document text
    • https://jasevumoxemu.weebly.com/uploads/1/3/4/7/134707335/duvutow.pdfIn PDF document text
    • https://wokukowuvewa.weebly.com/uploads/1/3/4/3/134316041/fbff5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/paropabaru/linexapixow.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/coloring_sheets_for_farm_animals.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/android_file_from_php_server.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/baligolode.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/somamagosabeg.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/94834984409.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DD 4972 bytes
SHA-256: 5969aee3528fa793ed097d0fe82d813693f0e215e139b6b7c6106220eb7f99a6
font_01_sfnt_off0000f57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 11272 bytes
SHA-256: e5a3a1f3561da6737a1d05b7e0276e97bb3f7be84a1ab7fedb6f4a50d1d16078
font_02_sfnt_off00011c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C03 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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