Malicious PDF — malware analysis report

Static analysis result for SHA-256 216e7bb125b7f7f0…

MALICIOUS

PDF

86.6 KB Created: 2021-03-29 00:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a5c2fcfd89ccaa59f8139e737292f87 SHA-1: 52b3c922ed4e69664728580f1d767370940f9d13 SHA-256: 216e7bb125b7f7f01e8318779458f6f56832246a9c52e19d0d7f1e65163cdd09
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as academic search results, indicating a link farm designed to direct users to potentially malicious websites. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bologen.ru/wix?keyword=electricity+and+magnetism+purcell+solutions+pdf
    • http://firstflirts.site/198729414253x0au.pdf
    • https://pewituzusab.weebly.com/uploads/1/3/0/8/130874049/12440.pdf
    • http://anbieterbewertung-autoscoutch.com/34415567450tz1p8.pdf
    • https://tekeginisexufu.weebly.com/uploads/1/3/1/3/131381150/9680cee65a33c1.pdf
    • http://frasqen.online/suburban_rv_furnace_repair_partsveicm.pdf
    • https://mokonalu.weebly.com/uploads/1/3/0/7/130739423/153085.pdf
    • http://tomandbxof.site/chapter_8_review_chemistry_answersoncbr.pdf
    • http://nakrutkavk.site/memunazubujini44a0.pdf
    • http://ig-support-service.com/javascript_callback_android_webviewgmidk.pdf
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/rozijopunazuma.pdf
    • http://barbanapoli.moscow/fodoxomumapibusi30i6x.pdf
    • https://juwaxevepatasi.weebly.com/uploads/1/3/0/8/130874094/6b88dc5314.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_bc976356ab6341c78469e41c7e965316.pdf?index=true
    • https://37459de8-d961-4a2a-897a-801dad55dcfc.filesusr.com/ugd/1395e2_03a43121bedd49929dce6b13aa572d55.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cdfdd294-3019-4c3c-b1aa-72e8a8a6af25/what_topics_are_included_in_algebra.pdf
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_e5ea41a0c95c4005adf400808045860a.pdf?index=true
    • https://s3.amazonaws.com/dikobepibelun/commission_payroll_spreadsheet.pdf
    • https://s3.amazonaws.com/migivewuwe/definisi_hedonisme.pdf
    • https://uploads.strikinglycdn.com/files/eea4fb81-4028-43a5-8427-1eabd024d041/how_to_clean_the_inside_of_a_masterbuilt_electric_smoker.pdf
    • https://uploads.strikinglycdn.com/files/9208cfa2-f675-49fc-adb8-e37a175475f5/watts_premier_zro-4_replacement_filters.pdf
    • https://s3.amazonaws.com/gixawetopoli/check_your_answers_math.pdf
    • https://s3.amazonaws.com/jobavo/home_loan_repayment_calculator_excel_sheet.pdf
    • https://uploads.strikinglycdn.com/files/7fca436c-7f1c-4fd6-b532-56d5c4cf1cee/life_fitness_elliptical_reviews.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df6c.bin
49943be28492052f83e99e261c0e4cd61524c19ad743ff6108dc8cba0f6a66a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6C 15704 bytes
font_01_sfnt_off000111b3.bin
e7e041314c5a4db7b3ee6b047dd67bbde90ccc456c1278e06a8ca9939452a2ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111B3 5532 bytes
font_02_sfnt_off0001247d.bin
1ac3e96fdeb4da57ef884bf9d936741adec41c9f524c022d11d7b6ecda7e70da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1247D 11508 bytes

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