Malicious PDF — malware analysis report

Static analysis result for SHA-256 073b3866354feb0c…

MALICIOUS

PDF

79.5 KB Created: 2021-03-14 11:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47db98d8c69611dd6a8b95843d954adf SHA-1: 88df851ffd5f0e1a54517bcf9e666d831060c0d4 SHA-256: 073b3866354feb0c3e6e00dfdbe33bca70a21609391fca154fee6bc7ca9bef4f
156 Risk Score

Malware Insights

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

The PDF contains a link farm designed to mimic search results, directing users to a malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a phishing campaign, potentially leveraging embedded JavaScript for further actions.

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-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://druttle.ru/award?keyword=asterix+and+obelix+all+at+sea+pdf
    • https://static.s123-cdn-static.com/uploads/4483586/normal_5fde8f7fb5fa6.pdf
    • https://cdn.sqhk.co/kosifodalab/ggjjhhj/sezuvomoperugiwufin.pdf
    • http://wolifote.getenjoyment.net/astm_a1064.pdf
    • https://cdn-cms.f-static.net/uploads/4474980/normal_6010320bd54cd.pdf
    • https://cdn-cms.f-static.net/uploads/4486743/normal_6019d031b534f.pdf
    • https://cdn-cms.f-static.net/uploads/4495034/normal_6032725ae35d4.pdf
    • https://cdn-cms.f-static.net/uploads/4446273/normal_6039d837399cf.pdf
    • https://cdn-cms.f-static.net/uploads/4385217/normal_60471f66573c5.pdf
    • https://cdn.sqhk.co/levowexesu/j40fj63/hey_clay_aliens_uk.pdf
    • https://cdn.sqhk.co/vuvesanap/2ijWiaU/32793236867.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sobaketemu/jopagililalejexun.pdf
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_2cd16c88213347fbb64973fba270705a.pdf?index=true
    • https://s3.amazonaws.com/fulazelof/what_food_is_good_for_blood_group_b_positive.pdf
    • http://raxajabidadida.onlinewebshop.net/zetenif.pdf
    • https://s3.amazonaws.com/degagaziv/memofovuwagata.pdf
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_062a0c00182a41bd9f1f2f62117b4f5f.pdf?index=true
    • https://s3.amazonaws.com/dinilederu/popalopuwasebesuna.pdf
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_072c85b4f07947d281033b16165e5125.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_off0000f0b9.bin
73f7058670340acb0360c9020be71232c407f03c044cb76a9a17552d127f446e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 5232 bytes
font_01_sfnt_off00010291.bin
0d8ba176245ff24f17c2b11fb3d96012a38a5369f943f6b13a44693799418d6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 14440 bytes

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