Malicious PDF — malware analysis report

Static analysis result for SHA-256 42289fcf21f4bf98…

MALICIOUS

PDF

87.8 KB Created: 2021-01-12 05:04:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9616df1fca898ff3604c1ee55e216b30 SHA-1: b4321973625ab402d502abc7dc2567dc29f3e95f SHA-256: 42289fcf21f4bf983fdca57f64beee9a89907b5f121a400dd1b3c4228897c297
214 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a known malicious redirector. The ClamAV detection and ML classifier also indicate maliciousness. The presence of numerous links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=integral+test+for+convergence+or+divergence
    • https://wevinavuligi.weebly.com/uploads/1/3/4/5/134505150/zonaluluk_bomiw.pdf
    • https://cdn.sqhk.co/mosugukasiba/hlifgiH/mountaineering_definition_dictionary.pdf
    • https://woninulanomawij.weebly.com/uploads/1/3/4/6/134670754/36d29.pdf
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/kimirexenu-nowawu-kuwuzaripebizuv-gipofode.pdf
    • https://cdn-cms.f-static.net/uploads/4376088/normal_5f97c767d1d08.pdf
    • https://static.s123-cdn-static.com/uploads/4371508/normal_5ff50c14845a7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tojazudibumogab/line_graph_worksheets_2nd_grade.pdf
    • https://s3.amazonaws.com/takeju/wallpaper_anime_charlotte_hd.pdf
    • https://s3.amazonaws.com/mulerux/android_pay_uk_lloyds.pdf
    • https://s3.amazonaws.com/wilugugo/carmine_gallo_five_stars.pdf
    • https://s3.amazonaws.com/debamijizozexo/53540686298.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d903.bin
10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD903 2900 bytes
font_01_sfnt_off0000e346.bin
7cc6e4c95117e9a81e0c8a159421236c946556f621072bf0c3af0b1a073e57fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 5184 bytes
font_02_sfnt_off0000f4c6.bin
fba9f6d5d467b7d6bbccdc8ac95b73ea8a6825a62cfb156e50cd914bb525142d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 6300 bytes
font_03_sfnt_off0001041f.bin
a54b6017351759d3cf91c1ddb8096b09fc6f6f70ee911e3985f565ede7800185		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 17732 bytes
font_04_sfnt_off00013b68.bin
a196436454caf81a383b0ecfd214a44fd1421605ce2ce0a88750df9da603749f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B68 16264 bytes

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