Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87a7539bf4ae25f…

MALICIOUS

PDF

75.0 KB Created: 2021-03-17 04:43:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c8aedfb38c5fe8ffb9abaaa15c463bc SHA-1: 74bd9056d6f346fb922bbec32030c5b103db16fc SHA-256: c87a7539bf4ae25f3551978342afda16ec568c1a8070ed318563f0a4bb698bdd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a "PDF_SEO_LINK_FARM" heuristic, suggesting a malicious intent to manipulate search results or redirect users. The ClamAV detection and ML classifier flagging further support its malicious nature. While no explicit script was found, the presence of embedded URLs and the nature of the heuristics indicate a likely phishing or redirection attack, potentially leveraging embedded JavaScript for malicious actions.

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-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://zajinet.ru/award?keyword=asthma+guidelines+australia+pdf
    • https://static.s123-cdn-static.com/uploads/4471711/normal_5ff05ed4bf748.pdf
    • https://durosokikiw.weebly.com/uploads/1/3/1/3/131379956/xikanumosunikofuwasi.pdf
    • https://sanepawoja.weebly.com/uploads/1/3/4/5/134579143/fogoxetegi_samipilumugoda.pdf
    • https://firunonosud.weebly.com/uploads/1/3/6/0/136052948/f13218e.pdf
    • https://nosekixiruwem.weebly.com/uploads/1/3/1/3/131380944/9327266.pdf
    • https://static.s123-cdn-static.com/uploads/4426974/normal_5fffbada5e8a1.pdf
    • https://static.s123-cdn-static.com/uploads/4494868/normal_5ff3013de0c3b.pdf
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/2499956.pdf
    • https://tadegelu.weebly.com/uploads/1/3/4/7/134734806/samegerofodagunel.pdf
    • https://cdn-cms.f-static.net/uploads/4459164/normal_6022673bc1822.pdf
    • https://cdn-cms.f-static.net/uploads/4454432/normal_602c68c3143bc.pdf
    • https://cdn-cms.f-static.net/uploads/4485573/normal_6038776109297.pdf
    • https://cdn-cms.f-static.net/uploads/4379498/normal_604aab875a252.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tujeviwakirawu/tixap.pdf
    • https://s3.amazonaws.com/xupizewuxere/2019_ms_word_calendar_template.pdf
    • https://s3.amazonaws.com/sefiwegegagu/macgyver_2016_episodes_guide.pdf
    • https://s3.amazonaws.com/feliso/3839470445.pdf
    • https://s3.amazonaws.com/bezorito/35717166764.pdf
    • https://s3.amazonaws.com/tipikaxe/printable_1st_grade_reading_worksheets.pdf
    • https://s3.amazonaws.com/bulikowexunepov/nokogobowilenuriloduxad.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_off0000e734.bin
d07126e936793e788dd36e4a0fd1106282b03d770a8ac6d7e3deb564ac703b41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE734 5444 bytes
font_01_sfnt_off0000f98c.bin
935b6bbab1915949a8f71210567b5885d964985c3138f86377d1194f26da0d2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF98C 10792 bytes

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