Malicious PDF — malware analysis report

Static analysis result for SHA-256 b555dcc68998c9a6…

MALICIOUS

PDF

76.1 KB Created: 2021-03-21 03:22:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e734c0f50c4279d4a912be23467a42f8 SHA-1: d5093e39a08c41fbb130e757cc53ce443fab7c7e SHA-256: b555dcc68998c9a6d72bbc018ba0eb0810eae0cfb5ad9465338a55f695de4eb6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, characteristic of an SEO spam or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=latitude+and+longitude+regents+questions
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/61561.pdf
    • http://jekefidaz.mygamesonline.org/living_in_balance_session_19.pdf
    • https://xuxukogizi.weebly.com/uploads/1/3/5/3/135320654/bosupobabojuziw_xiziritotanumo_zoxozomovozu_sepewesumen.pdf
    • https://wexewuvaxodewo.weebly.com/uploads/1/3/1/4/131407465/66175f519b3e.pdf
    • http://roxelejabojafe.scienceontheweb.net/aerospace_engineering_course.pdf
    • https://xewidepomizexas.weebly.com/uploads/1/3/0/7/130775014/193000125d.pdf
    • https://betufevu.weebly.com/uploads/1/3/4/0/134098732/6384736.pdf
    • https://tatudibew.weebly.com/uploads/1/3/0/8/130813899/ecdb5498c0528.pdf
    • http://sakulog.sportsontheweb.net/beauty_and_the_beast_prologue_piano_sheet_music.pdf
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/jexefaxesov.pdf
    • https://wuwabisa.weebly.com/uploads/1/3/1/6/131606234/jasovuned_wajomijim.pdf
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/tezufitojo_xejum.pdf
    • http://jatudoz.getenjoyment.net/vexazetoxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_d2a42a0dc5dd413498425b20220de0b4.pdf?index=true
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_1bdb455dbb844a9582b847fafc6a7f51.pdf?index=true
    • https://s3.amazonaws.com/fadobirak/77949084926.pdf
    • http://vugugemo.atwebpages.com/92190607712.pdf
    • http://likutolejit.onlinewebshop.net/12850242679.pdf
    • https://bf2b7b75-7790-49a7-81e6-d2546e692b42.filesusr.com/ugd/8ccf63_7ab5d81923b944d4b4b17bba23df8dc4.pdf?index=true
    • https://s3.amazonaws.com/veledabejufi/nutrient_dense_diet_guidelines.pdf
    • https://1e35b969-1f99-48dc-8aa8-d0fb9638bdc8.filesusr.com/ugd/970baa_4900193eacfc4aafa1ffda1760d2e164.pdf?index=true
    • https://s3.amazonaws.com/jenisozazewubo/how_can_i_tell_if_my_harry_potter_book_is_a_first_edition.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_off0000ed1a.bin
0acf6017ed24d44a7d83aebc7ce06f1940a60b31a69808d189c418eb11e7c8d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 5060 bytes
font_01_sfnt_off0000fe59.bin
e728313fdd23d17bf2c571b54ed35959ee7372cce2b51755f6f8f141dfef962a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 10800 bytes

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