Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a277d9147a65d66…

MALICIOUS

PDF

96.1 KB Created: 2021-04-26 01:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa55daa5089cbb7456b4c5ce53204a58 SHA-1: 281b6a3fcb0f6a8134854597e88b9de62654164d SHA-256: 9a277d9147a65d66f84351e6b87b4397064957bea60a4186474f3756e433ab1d
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, many of which are designed to appear as search results for common queries. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm. The primary malicious URL identified is zajinet.ru, which is likely used to host or redirect to further malicious content. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=ge+roaster+oven+turkey+cooking+times
    • https://cdn-cms.f-static.net/uploads/4451954/normal_603d1d9cb0dee.pdf
    • https://tubekari.weebly.com/uploads/1/3/1/6/131636965/zatirujoxuwenad_rimekudatevono.pdf
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/c030c1faf8.pdf
    • https://cdn.sqhk.co/kiribikiv/ivmZhg7/dave_letterman_top_10_lists.pdf
    • https://cdn.sqhk.co/gixedomawa/a9hbZic/76255940174.pdf
    • https://cdn-cms.f-static.net/uploads/4485434/normal_600a403e351d0.pdf
    • https://cdn.sqhk.co/pazaxefuma/gjYbhea/twisted_tea_calories_can.pdf
    • https://cdn.sqhk.co/xarozowuzosa/iciephc/zikeboravafuzereles.pdf
    • https://cdn-cms.f-static.net/uploads/4457582/normal_6021f8cd4c9f2.pdf
    • https://luwupedo.weebly.com/uploads/1/3/1/3/131383743/bd891b45ed.pdf
    • https://feliwisinawo.weebly.com/uploads/1/3/1/8/131856919/ebf58.pdf
    • https://cdn-cms.f-static.net/uploads/4470207/normal_60294eef36211.pdf
    • https://cdn.sqhk.co/bobimugura/4ggKujj/8661542502.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_e861b72c963b4687a01e457cfbb75126.pdf?index=true
    • https://s3.amazonaws.com/wolina/custom_airbrushed_air_force_1_shoes.pdf
    • https://s3.amazonaws.com/wesezuzuvalirik/36509268553.pdf
    • https://s3.amazonaws.com/wuzalugiseto/kalinarixojogobub.pdf
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_e55a0aa2ba134ecab869c1043da5e3d3.pdf?index=true
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_dead7f306949454fa255a89a2e576178.pdf?index=true
    • https://s3.amazonaws.com/dojivewobasuval/kung_fu_hustle_english_dub_cast.pdf
    • https://s3.amazonaws.com/bejokazemur/9277692024.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_off00013a09.bin
39ada314cfffe39d2d529ccbbea830b14f40e46acf6b15427378958dae32387a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A09 5344 bytes
font_01_sfnt_off00014c37.bin
0e65836f8ca41589da18d9be8b5a7db12c10cb708101374d649c507d8b788397		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C37 11436 bytes

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