Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca14d307abc706f…

MALICIOUS

PDF

84.4 KB Created: 2021-04-02 18:39:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 523e0c61c1cfd0644c8cfe9bc25c5932 SHA-1: 80078fadf951da2139d5b08188095be5924bf8e2 SHA-256: 5ca14d307abc706ff834cfaabc08e6e5684f3c27854b8ba25fd6728b28b5bda5
156 Risk Score

Malware Insights

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

The PDF file contains a lure related to winning the lottery for free, indicated by the document body and the presence of external URIs. The heuristic PDF_SEO_LINK_FARM firing suggests the PDF is part of a link farm, likely designed to drive traffic to malicious or scam websites. ClamAV detection and ML classification further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/wix?keyword=como+ganhar+na+mega+sena+gratis
    • http://lebofawudire.mygamesonline.org/zotesobobaloxejuduxekupuf.pdf
    • https://cdn-cms.f-static.net/uploads/4475728/normal_6014e4b95eb39.pdf
    • https://static.s123-cdn-static.com/uploads/4374520/normal_60032cc00710e.pdf
    • https://baziwiruxufuwav.weebly.com/uploads/1/3/1/4/131482892/5172146.pdf
    • https://zemizipip.weebly.com/uploads/1/3/4/0/134098502/4296196.pdf
    • https://pegemogavabupaz.weebly.com/uploads/1/3/4/3/134310843/jujusokim_bugumimufud_xebidupovorisap_nexofisilugumiz.pdf
    • http://fotubobuwenapu.scienceontheweb.net/casio_hr-100tm_feed_paper.pdf
    • https://puzapageduz.weebly.com/uploads/1/3/1/4/131453954/nawuxoxoxezoj_kuwarujovonubef_podemajidipar.pdf
    • https://static.s123-cdn-static.com/uploads/4366401/normal_5fde912cbbc8f.pdf
    • https://likixolokezixi.weebly.com/uploads/1/3/0/7/130738950/9952195.pdf
    • http://rulajamizap.getenjoyment.net/learn_english_grammar_step_by_step_in_tamil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_4da781c6d5004c81923cf0c7727547e3.pdf?index=true
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_ded38756acc4465dbafb963ee591d8e5.pdf?index=true
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_08f17f4d192949418eafd454d766ff71.pdf?index=true
    • https://s3.amazonaws.com/wezukep/73876991211.pdf
    • https://s3.amazonaws.com/rimejiguvif/32931420843.pdf
    • https://s3.amazonaws.com/votawawo/koraladil.pdf
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_a6832cbb8d614806b8ba46e931c307bd.pdf?index=true
    • https://s3.amazonaws.com/gaxuremewuger/2091591040.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c0.bin
5fb2e6af4d68b969d2770fc70649be39d2bf859de9e8eddbfc68383d07fe9786		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 4972 bytes
font_01_sfnt_off00010277.bin
652db162e0822447d4e93047266ed1966f304f4ede2e0bdda5dcc8a9f6074fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 13888 bytes
font_02_sfnt_off00012cfc.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFC 16204 bytes

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