Malicious PDF — malware analysis report

Static analysis result for SHA-256 048633136c70dea3…

MALICIOUS

PDF

73.5 KB Created: 2021-02-11 02:07:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 282b700351938d980da7ed53d15bf6cc SHA-1: fd401c40c9d4d659555460ec1489a98194cf52bb SHA-256: 048633136c70dea356b26c79df8c46018655fd61116a66b124bcc7b75f5c6f3b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a large link farm. One prominent external URI, 'https://baarspo.ru/wb?keyword=belajar%20mikrokontroler%20atmega8535%20pdf', is likely the primary lure. ClamAV detection and ML classification strongly indicate malicious intent, consistent with 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://baarspo.ru/wb?keyword=belajar%20mikrokontroler%20atmega8535%20pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378836/normal_5fdfa62e312d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479441/normal_601d688a7584d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379038/normal_5fcf07e213059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480579/normal_6010889048c25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393632/normal_5fc7a8d123b54.pdfIn PDF document text
    • https://tenemetit.weebly.com/uploads/1/3/2/6/132696414/42eab5fe2069c1.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/ee4f9a4ff8ead.pdfIn PDF document text
    • https://xakivemo.weebly.com/uploads/1/3/0/7/130739368/sezosum_vikojomazat_mavifefovoja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448343/normal_5fc5e58a50e17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451755/normal_601996fa97b01.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/tobobowu/oxford_dictionary_for_windows_10_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/2001055362.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/mafewibofeziredokiworibep.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/fufanate.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/33154296714.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/88854141061.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/13502078348.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_off0000dc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0B 5852 bytes
SHA-256: 7a534a202eb7d470927644898314f00988a94a22e4a855588c95c77dfcce8281
font_01_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 11372 bytes
SHA-256: af668fb3a705dedc89cb03bdd323d625271e69e9d19a9973343f8a924fe981c8

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