Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bea130a6776a507…

MALICIOUS

PDF

75.5 KB Created: 2021-03-14 23:47:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7cd0f15bbaf59e80ffb01679d9f703d SHA-1: 260043d92003c06ea8475c5b7c8ca3789a08a31e SHA-256: 4bea130a6776a5077cd0ed7179658835e135617332a8e107e60c2019347980fd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. The embedded URLs and the heuristic firings suggest an attempt to redirect users to potentially malicious websites for SEO purposes or to host further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/award?keyword=anti+ulcer+drugs+pdf
    • https://xafasujogi.weebly.com/uploads/1/3/4/3/134374351/xejizuv_dakunu_sagobusufizix_refabe.pdf
    • http://gigezesuzobe.getenjoyment.net/how_to_clear_rap_exam.pdf
    • https://cdn-cms.f-static.net/uploads/4417119/normal_5fda67f4300a3.pdf
    • https://static.s123-cdn-static.com/uploads/4405644/normal_5fe506a1a7bee.pdf
    • https://xakokizape.weebly.com/uploads/1/3/4/3/134343218/puvuw-xeremer.pdf
    • http://vijexibat.mywebcommunity.org/do_pizza_hut_employees_get_a_discount.pdf
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/sewajujonatiridot.pdf
    • https://tanibabinilez.weebly.com/uploads/1/3/4/0/134018029/lonibaxepelopudabug.pdf
    • https://cdn-cms.f-static.net/uploads/4421612/normal_603802e1f2890.pdf
    • https://cdn-cms.f-static.net/uploads/4488581/normal_5fd66705e1a9d.pdf
    • http://zogometemo.sportsontheweb.net/adb_android_tutorial.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_104a1821c81643e9861c31e669670a6d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6b21ebb6-8f65-43af-a057-2994ca1fbadc/noam_chomsky_theory_of_language_learning.pdf
    • https://uploads.strikinglycdn.com/files/4af2979a-4f65-409e-8487-3cde106e6c42/keurig_2.0_k300.pdf
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_2f4e64567ad24fcdaa0b64ec7cca2772.pdf?index=true
    • https://uploads.strikinglycdn.com/files/43c326bd-2459-4b59-8830-3661ef3eb3de/dewilaribateseputo.pdf
    • http://noxokabebixe.epizy.com/armadillo_dragon_breeding_guide.pdf
    • http://gemawinikifiv.myartsonline.com/codex_adeptus_custodes_8e.pdf
    • https://uploads.strikinglycdn.com/files/82e51d8b-25d3-49ad-a88f-d64fc892641f/53880222134.pdf
    • http://zotodigigaki.epizy.com/71492187957.pdf
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_9f8f87099ebd488fbf1b543824e84a0b.pdf?index=true
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_f31e64700e834dd2b10ae0334af4aa89.pdf?index=true
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_a59025e4e6a64b8da415a3e045a4c8ac.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_off0000ecf7.bin
90beb2cc95c77bc68311dd06eb05a46cd146b92aa5160fd9b68bfb65c56c9613		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 5104 bytes
font_01_sfnt_off0000fe6a.bin
0b33b287c338f2543506c487ae6af815a4298a6dd65668d8c60bedf3c8094daf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6A 10148 bytes

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