Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe91727c95c14808…

MALICIOUS

PDF

76.1 KB Created: 2021-03-25 16:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4bdfd8c37e1b2004a467bb81baca1fe SHA-1: dc597ceca51d46c4a83922a6e02c350d61bc62d0 SHA-256: fe91727c95c14808d8a808e2b2c3c02d5c8368ebf6036b9b762649a725125d9b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF link farm, with one prominent URL related to 'mortal kombat apk download'. ClamAV detected this as a phishing trojan, and ML classifiers also flagged it as malicious. The presence of numerous links suggests an attempt to direct users to malicious websites or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ponafet.ru/wix?keyword=mortal+kombat+apk+download
    • https://cdn-cms.f-static.net/uploads/4419849/normal_6014ba725921b.pdf
    • https://static.s123-cdn-static.com/uploads/4458848/normal_5ffe95c892ab3.pdf
    • http://fibutogu.mywebcommunity.org/links_awakening_guide_book.pdf
    • https://faremuxonebaw.weebly.com/uploads/1/3/4/5/134598019/sibupepevageze_mijabufuwen.pdf
    • https://wigewowatabosaz.weebly.com/uploads/1/3/4/3/134352056/gorojeko_sokojepubeli_vuxaf_tapug.pdf
    • https://dikarofojosej.weebly.com/uploads/1/3/3/9/133988548/402535.pdf
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/cc292a7a97e2.pdf
    • https://cdn-cms.f-static.net/uploads/4475728/normal_6016c38a7060a.pdf
    • https://lulegosepo.weebly.com/uploads/1/3/0/9/130969478/vekuwuzanikita.pdf
    • https://pesakezered.weebly.com/uploads/1/3/4/7/134729162/fesosawitiwowuxusuje.pdf
    • https://static.s123-cdn-static.com/uploads/4465564/normal_5fe3e3a6be2af.pdf
    • https://cdn-cms.f-static.net/uploads/4451047/normal_602d4f63803ee.pdf
    • http://paxabak.mypressonline.com/76252972634.pdf
    • https://jivudajen.weebly.com/uploads/1/3/4/4/134470456/9815983.pdf
    • https://siduwibe.weebly.com/uploads/1/3/4/7/134775996/9c681d2177b1d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sajomapujozokux.onlinewebshop.net/gekuwuzofiruz.pdf
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_0fa1ede62faa434ca8846f5133c60865.pdf?index=true
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_7fae6168f61e4908b06d0b81bc12b7e0.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_off0000dfe3.bin
9c226134b6a7180d48219c2ab4b42c9d1bc2b638f4587b032e9004443c5c5ed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 5228 bytes
font_01_sfnt_off0000f1a6.bin
3995c12243a1e8623cb33b665807b692d77049a68c4caf362b5f7f4bd090f888		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 21940 bytes

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