Malicious PDF — malware analysis report

Static analysis result for SHA-256 47f9bb307ce5b4dd…

MALICIOUS

PDF

75.0 KB Created: 2021-03-16 20:21:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb51cf3f9be943dad87d010c29ac1789 SHA-1: 577779827f34efe999f537b56d7b958bbc309c32 SHA-256: 47f9bb307ce5b4ddfab2499e66c5e69d5f2756305cabb509b2d26d3e8f7d2f2d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The primary external URI points to a URL that appears to be part of a SEO spam campaign, likely intended to redirect users to malicious content or phishing pages.

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://jumiwimov.ru/award?keyword=water+jet+cutting+machine+working+principle+pdf
    • https://xadajosawot.weebly.com/uploads/1/3/1/6/131636584/7220665.pdf
    • https://xateboduf.weebly.com/uploads/1/3/1/4/131483383/genulibikekuzax-gananizo.pdf
    • https://vetedikagumon.weebly.com/uploads/1/3/1/4/131453784/9401005.pdf
    • https://dezuvamugofa.weebly.com/uploads/1/3/4/1/134131805/3718809ae495.pdf
    • https://vanazufir.weebly.com/uploads/1/3/2/7/132740694/kizigiwu-kirijenesere-kafevituwu.pdf
    • https://zutafagufagupak.weebly.com/uploads/1/3/4/2/134235067/5196194.pdf
    • https://werukubafufu.weebly.com/uploads/1/3/4/0/134000234/romujaz.pdf
    • https://pogedufofow.weebly.com/uploads/1/3/4/5/134512351/3c597.pdf
    • https://gokepitamewema.weebly.com/uploads/1/3/5/3/135325242/696b7a1113873.pdf
    • http://kupelobivinix.22web.org/integral_calculus_examples.pdf
    • https://zunodeni.weebly.com/uploads/1/3/1/0/131070331/7247890.pdf
    • https://rakafofolobe.weebly.com/uploads/1/3/4/6/134649319/5553228.pdf
    • https://zipazoraxegav.weebly.com/uploads/1/3/4/3/134325660/zujexadiviles.pdf
    • http://kewujedirolut.22web.org/62423784285.pdf
    • https://dipidedi.weebly.com/uploads/1/3/2/8/132815933/961601.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_0db26cef90c14b5bb06f1ccc5dde6f9a.pdf?index=true
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_8ff32ab3e570497ba4d78c6040eff795.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dd06a473-1b6a-4500-abe2-cf24bf0cd5ec/favupexinisalavamatuv.pdf
    • https://uploads.strikinglycdn.com/files/fef8a18d-9a64-4d45-b6d6-d1b9e751e417/70349061655.pdf
    • http://katosijuxemewex.rf.gd/wumabetuzafilugofonis.pdf
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_cb85a50ccc9845f28dfffb5eae4d795d.pdf?index=true
    • 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_off0000e777.bin
9c3a246af3f1ac63422ece966abd26d5cdfe8fa7ba044cba67529e5c80a4010e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 5636 bytes
font_01_sfnt_off0000faa0.bin
611dafbcd660f63ef632ee262b58765c8db7bbe46921e47bd98ed7d17794e42b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 10460 bytes

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