Malicious PDF — malware analysis report

Static analysis result for SHA-256 1202318a6b17bea1…

MALICIOUS

PDF

61.9 KB Created: 2020-12-18 07:25:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 150e9f4d13e0a5b442828611247d4471 SHA-1: 1537f81bd074f8f20fb23d976d7ddfd09234ba4a SHA-256: 1202318a6b17bea1de4fa5ac6dfe891959fc5c2b1d512b47a4dcf9dd31617d9d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to an educational topic, suggesting a phishing or social engineering attempt to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/strik?utm_term=the+american+free+enterprise+system+lesson+2+answer+key
    • https://sedanafijokam.weebly.com/uploads/1/3/4/8/134888359/jasenavi-riwosupenuvuru-vibaga-melazowavaro.pdf
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/19b9ca4c0093b77.pdf
    • https://ladetizor.weebly.com/uploads/1/3/4/7/134731735/zajinatega.pdf
    • https://vifepupu.weebly.com/uploads/1/3/4/8/134886621/kulukuwatofeb.pdf
    • https://fonevufaj.weebly.com/uploads/1/3/4/4/134444269/5077725.pdf
    • https://fedijukesubi.weebly.com/uploads/1/3/4/6/134600597/4c7cff2eaff8.pdf
    • https://cdn-cms.f-static.net/uploads/4388285/normal_5f9f2c9aa549f.pdf
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/7433167.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xanebavifamopez/marcapasos_temporal.pdf
    • https://uploads.strikinglycdn.com/files/749b8809-ae7a-46f6-ac53-9c5e34309506/justin_and_the_knight_of_valour_full_movie_download_in_mp4_dubbed.pdf
    • https://s3.amazonaws.com/tetazino/sesadozinotugijim.pdf
    • https://uploads.strikinglycdn.com/files/be56ce06-da59-41e8-b95c-f53836dd56c6/92884082320.pdf
    • https://s3.amazonaws.com/wewiro/calendario_2019_gratis.pdf
    • https://s3.amazonaws.com/samopakamefap/66366234194.pdf
    • https://s3.amazonaws.com/mefonevimimix/filmora_blockbuster_effects_free_windows_7.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b57b.bin
60751f04bbbab2753d158c69679af91233b47ab11c4f6938f7678af849012f8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB57B 5592 bytes
font_01_sfnt_off0000c871.bin
f78dc13f76309fd639ef6b89abee2aef5cc569bf271c5ff462513f0da4e975a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC871 9960 bytes

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