Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2724aed402a0fae…

MALICIOUS

PDF

81.9 KB Created: 2021-01-08 05:49:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6f5ed806e19565cc945e4daa8349112c SHA-1: 7afc3f433d7b6a8171826e95acaa891fb7572371 SHA-256: c2724aed402a0faecba2c94c0ef39c7c1de7a1b80e186d1ff3d52bdef463852d
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by multiple critical heuristics as a malicious PDF redirector and a link farm. It contains numerous embedded URLs, with at least one pointing to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The PDF's purpose appears to be directing users to external sites, likely for phishing or to serve additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/123?utm_term=philadelphia+american+life+insurance+company In PDF document text
    • https://static.s123-cdn-static.com/uploads/4426815/normal_5fd04b9261db6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409992/normal_5f9baff4dc2ab.pdfIn PDF document text
    • https://gexupiru.weebly.com/uploads/1/3/4/5/134576942/lexevurizodej-lumuribo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368478/normal_5fe40221825e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476443/normal_5fd5fb6f0ff69.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/FysgiRH/average_height_for_women_california.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408333/normal_5f9c809d292aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372967/normal_5fe0cff0e097c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375088/normal_5fb8ad73cfb33.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/SiadBja/bullet_time_fighting_2.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/gebikovakojoweresa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/baposivarabuj/1v1.lol_unblocked_funblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/monil.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/walnut_street_elementary_school_des_moines_ia.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 5300 bytes
SHA-256: b1df6b8fac655891d000aa2a7017aadab426fef6821be268722a6435aab3103a
font_01_sfnt_off000106fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 11112 bytes
SHA-256: 5a4c309fb60e210395c3595c991302ad4af0d800828d7b01d03b3a6cc69cf221
font_02_sfnt_off00012cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB1 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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