Malicious PDF — malware analysis report

Static analysis result for SHA-256 57447f66a160b456…

MALICIOUS

PDF

74.6 KB Created: 2021-03-23 13:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d106a638cf296c9b2acf9a12dfc339db SHA-1: cdcdb4d1543cc3f126b7078d23014c7611bbb851 SHA-256: 57447f66a160b45620d349e34db4eabbf0f70aea0e4f3c58e4e4206625f2ebb3
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including ClamAV detecting it as a phishing trojan. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or SEO abuse tactic. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/award?keyword=alleluja+boyce+nuty+pdf PDF link annotation
    • http://itabody.space/nibiramepibigamixapi1hyet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408324/normal_5fc56e4b8778a.pdfIn PDF document text
    • http://lessonsonline.site/android_antivirus_reviewwkyag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427783/normal_605834cb5f9e9.pdfIn PDF document text
    • http://itclick.info/sony_dsc_f828_price_in_pakistanpcfhx.pdfIn PDF document text
    • http://affilateapp.online/baruzugupisegegogojey458n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446377/normal_5fcc209e08143.pdfIn PDF document text
    • http://tevfikyuce.xyz/auld_lang_syne_piano_sheet_easy3l6av.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_f66de5058e9b4d93b2172fdc03ecc24c.pdf?index=trueIn PDF document text
    • https://85d16613-ccc4-41aa-b8ea-47abf6438ef2.filesusr.com/ugd/2d797c_335a1f0e18b1416dbd040cd441235e57.pdf?index=trueIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_ccd72875f5ab41508ff2d9068d880ed8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/rasagetabotatej.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/dancing_in_the_moonlight_violin_sheet_music.pdfIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_075db188229e4c4a8bc97adc7c512332.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_c71ad47a19fe4f209fe0da0a71b3efa8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/interview_questions_on_java_free.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/64885999346.pdfIn PDF document text
    • https://486a928f-df87-4682-b39c-9199637d78f9.filesusr.com/ugd/982a49_1e6e0a128db049d8948f51ae2936717a.pdf?index=trueIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_6c322206443a49b8872ac5aa9e45e8df.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 5180 bytes
SHA-256: da804629eb7536f24579a97363aa483c2dc43d8904460a8c70d28fb99c742bf2
font_01_sfnt_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 11336 bytes
SHA-256: 6151d72c48a2b67b2d098722513a24fe282a3ed4ce13856ebc733967fa4ef89b

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