Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b79080392d0ae5…

MALICIOUS

PDF

108.9 KB Created: 2021-03-25 03:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc6024ae4e115d8a75d369a296b3072d SHA-1: 58578aba05fab7150f5dbe2d14a1de213e2e77dc SHA-256: 48b79080392d0ae534b89db80695baee965195e4feb3ea040271a8eb512698e0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a PDF link farm. It contains numerous external URIs pointing to various PDF files, suggesting an attempt to manipulate search engine results or distribute a large number of potentially malicious documents. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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://xezojetit.ru/strik?utm_term=navy+correspondence+manual+memo+format
    • http://pifanaliriwabo.mygamesonline.org/fariti.pdf
    • https://cdn-cms.f-static.net/uploads/4378606/normal_60112ef14fdb8.pdf
    • https://static.s123-cdn-static.com/uploads/4499300/normal_6008fd76a5543.pdf
    • https://cdn.sqhk.co/vuzefegevo/je7fhhM/bed_and_bale_bc.pdf
    • http://bamirajewenexo.medianewsonline.com/20850381469.pdf
    • https://resusogid.weebly.com/uploads/1/3/5/3/135346187/761b383b64e4d6d.pdf
    • https://cdn.sqhk.co/xubupigegi/b2Slij1/buxuvivovefujiserij.pdf
    • http://mazipuvaxa.mywebcommunity.org/look_back_in_anger_as_a_realistic_play.pdf
    • https://penixosifa.weebly.com/uploads/1/3/1/4/131482878/ea6a66.pdf
    • https://putusura.weebly.com/uploads/1/3/1/6/131606782/b935cb40.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_6adc7194f6434c6b8b145bcf4157f02a.pdf?index=true
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_0a064cdce3954ba5bb28bf9a00f99501.pdf?index=true
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_1f39e6d0504842b48fc0f47fb58b1f81.pdf?index=true
    • http://jikafazasakojob.epizy.com/types_of_adjectives_worksheets_grade_4.pdf
    • https://4c8cc264-4606-483b-a6fd-3ab48ba5c15a.filesusr.com/ugd/c626f4_957b2c28c98147809e6ddaeddede4b28.pdf?index=true
    • http://tafoboverel.epizy.com/avast_antivirus_for_windows_10_pc.pdf
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_d80b5b0be96c42c3a1b5fdaa417b2e4a.pdf?index=true
    • http://vomotoboxavixot.epizy.com/carrom_board_game_for_jio_mobile.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_off00016f4c.bin
489504a57d905b831fe53df9136a1619ac7ac2e74592dcc1f74878458a0c168f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F4C 5432 bytes
font_01_sfnt_off000181cb.bin
6d9b0d41b93e3ad9d48c675b5759b4faa478f3a9cb18accf6d68d0cfd66a2614		 pdf-font-stream PDF embedded font (sfnt) at offset 0x181CB 10572 bytes

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