Malicious PDF — malware analysis report

Static analysis result for SHA-256 3238c15ef5dcd6cc…

MALICIOUS

PDF

76.8 KB Created: 2021-03-17 23:43:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 656eb71bd34e352efae0aaf1f1a4d6b0 SHA-1: 7ed8b67308f1129c719fa8ea69cc07886e98ac74 SHA-256: 3238c15ef5dcd6cc2abc830958cbf1518d460a2e6a95e558a5c403729cec9512
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to SEO-optimized content farms. One prominent URL, 'https://resalured.ru/wix?keyword=subaru+cherry+blossom+festival+2020', suggests a lure related to a specific event. The presence of a PDF link farm heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' indicates a malicious intent, likely to direct users to malicious sites or for spam distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/wix?keyword=subaru+cherry+blossom+festival+2020
    • http://copyright-helps-team.com/starting_strength_novice_program_resultsdgas3.pdf
    • https://cdn.sqhk.co/tonukabonuwe/ijV7zgi/47810465419.pdf
    • https://cdn.sqhk.co/gixegusu/ThcNyjR/65813980591.pdf
    • https://bezamefiparafu.weebly.com/uploads/1/3/4/6/134665790/kiziwimixufus-zijaworuvanelev.pdf
    • http://1xbets-regs.site/clash_of_clans_hack_online_2018um4zl.pdf
    • https://finukapaxareb.weebly.com/uploads/1/3/4/4/134494590/tupimolukutoxeno.pdf
    • https://bikafosujikus.weebly.com/uploads/1/3/2/8/132815014/2b3c2959f2a5.pdf
    • https://tadafemuge.weebly.com/uploads/1/3/4/4/134480681/498769.pdf
    • https://gorogonib.weebly.com/uploads/1/3/0/7/130775466/pomuroratamufef_tefigo.pdf
    • https://mefosenide.weebly.com/uploads/1/3/4/7/134715399/83252.pdf
    • http://sethel.xyz/nexibuwijudenomewetujobe0v3.pdf
    • http://werenntaq.online/mujalutajojegumitodoguwi4df1p.pdf
    • https://vekowafonomi.weebly.com/uploads/1/3/4/6/134692424/puwirurabitedum.pdf
    • https://cdn.sqhk.co/sutazojawote/gjeIp3S/77095685210.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/liwafo/biseselozo.pdf
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_5ccb7768690143b6b1812411d0b29d54.pdf?index=true
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_292e3d289fd14d7a81bd4ad5f6f97a05.pdf?index=true
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_5d86bd946cba441e98a889de5ac6ae12.pdf?index=true
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_28d1ef2442974e3bac6f305029b3dc5a.pdf?index=true
    • https://s3.amazonaws.com/gorajikunobixi/osrs_fishing_guide_f2p.pdf
    • https://s3.amazonaws.com/serogajugomiji/43289893967.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_off0000ea19.bin
165b2ed0a971ad1df46973080be6ab592affe5e1b1d107c8e5e2b91d83917457		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 5800 bytes
font_01_sfnt_off0000fdc4.bin
6483f3872fa4dab2dbb8ece570738ed7103026fd5eff8a6cd34654c4c8c68b91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 11284 bytes

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