Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20f06e569926f8c…

MALICIOUS

PDF

71.4 KB Created: 2021-03-22 07:15:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57c62575b73135aabc89fdc066d09e73 SHA-1: 841a541ae79e48848876f964dbd8616feb291ce2 SHA-256: f20f06e569926f8c11c5168db15aa0fbf45f0cce8ec9dc3a5535dc4f66e3acb8
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to educational content, which is a common tactic for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://bologen.ru/wix?keyword=bearings+sine+and+cosine+rule+worksheet
    • http://indital.space/fundamentals_of_corporate_finance_rossygyxr.pdf
    • https://cdn.sqhk.co/dedesonor/5KhfYNN/mutant_creatures_mod_mcpe.pdf
    • http://artelamp.store/rufumobiromutesowelusazoj1h0aj.pdf
    • http://itprod.space/olympics_2020_winter_or_summerqmx9o.pdf
    • https://cdn.sqhk.co/fufigavaki/ghfUihl/dancing_balloon_man_gif.pdf
    • http://jufikubenisobo.iblogger.org/72381844452.pdf
    • http://roman-holidays.shop/how_does_p90x_work_scheduleeqohb.pdf
    • http://sysfix.ru/the_dharma_bums_first_editionh0yw8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wuzalugiseto/usmle_step_1_2021.pdf
    • https://s3.amazonaws.com/zunewidimem/countertop_laminate_sheet_installation.pdf
    • https://s3.amazonaws.com/zazelujeju/think_fast_and_slow_book.pdf
    • http://xuxamasisovuku.epizy.com/46967704872.pdf
    • http://puzenufamem.rf.gd/pascal_triangle_in_python_using_while_loop.pdf
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_f4e06d82323c4e0496eaa3a70052e85a.pdf?index=true
    • https://s3.amazonaws.com/godewumazek/how_to_do_step_3_aa.pdf
    • https://s3.amazonaws.com/goviwigax/52367231000.pdf
    • https://s3.amazonaws.com/mexijegedakol/bemalusabi.pdf
    • https://s3.amazonaws.com/vososasoxumete/frontier_two_letter_code.pdf
    • https://949217f6-ecfc-4a1b-8806-967b2a145102.filesusr.com/ugd/b08fd2_19d94043823e43fdbab5e13a00dfda58.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9d6.bin
aefe0938553fb123c099d0d7b0a95100908d6c36cbd5b964f60f6261e9526195		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 5408 bytes
font_01_sfnt_off0000ec49.bin
9437f4aebab0dc86590d11a456f3905abb3a53cf3981b06b034da1755f4458e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 10612 bytes

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