Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2e16d1f4c00ce3b…

MALICIOUS

PDF

76.4 KB Created: 2021-03-30 11:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2b2531eb949535e479a97df1656d570 SHA-1: 70ad45cf520e20e839dc8e2d69195f3d7fc343bd SHA-256: d2e16d1f4c00ce3b3c14db9df30e420f77153c240be94310ff9bf08ec34b8dd6
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. One prominent URL, 'https://leonvi.ru/award?keyword=arbeitslosengeld+beantragen+unterlagen+pdf', suggests a phishing lure related to unemployment benefits. The presence of ML and ClamAV detections further supports its malicious nature, indicating it likely serves as a dropper or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=arbeitslosengeld+beantragen+unterlagen+pdf
    • http://zaluxujuso.iblogger.org/52013530440.pdf
    • http://nofosofeze.iblogger.org/50_common_english_phrases.pdf
    • https://fumixenigijulu.weebly.com/uploads/1/3/4/5/134526518/bokumuwasaru.pdf
    • http://discovljzg.fun/graco_mysize_65_convertible_car_seat_expiration_datea81wg.pdf
    • http://poverkavoda.website/crazy_zombie_9_hacked_moneyuv075.pdf
    • http://bavolotaw.22web.org/11900141074.pdf
    • https://wonozonozosog.weebly.com/uploads/1/3/1/3/131398184/nomasor-jodepinubexepa-kudoluwin.pdf
    • https://teraludejos.weebly.com/uploads/1/3/5/3/135304334/guverobitozuribo.pdf
    • https://dawudetunik.weebly.com/uploads/1/3/5/9/135972975/legawiled_xosijerijoka_tijugogemurivo_jirudixevamu.pdf
    • http://erogan24.website/buffers_in_biochemistrye3yyh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fcee5106-5dd7-4129-933f-0ffd1c55f9c4/technical_support_interview_questions_and_answers_for_freshers_in_tech_mahindra.pdf
    • https://uploads.strikinglycdn.com/files/52de7318-76a0-4cb3-a1b5-53eb0843e0ea/bamedibilevu.pdf
    • https://uploads.strikinglycdn.com/files/61efe5d3-ba76-4c76-8e4d-d1cd70a78325/69310456098.pdf
    • https://uploads.strikinglycdn.com/files/d8c301cd-a2e0-442b-ab90-f035afcade6f/excel_formulas_multiply_by_a_constant_cell.pdf
    • https://s3.amazonaws.com/rutufokedizon/63527862430.pdf
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_2433f98426834b9aaad899a9c1d77fbc.pdf?index=true
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_39b8cc2c2cdb4e2f8bb5e884a80ef763.pdf?index=true
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_a4bcfa6185cc41d4a1937e34cd1359ac.pdf?index=true
    • https://s3.amazonaws.com/jesidofefe/chain_of_command_chart_template.pdf
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_e0ec0df579794589b43096943a30dbff.pdf?index=true
    • https://s3.amazonaws.com/lopadivupudexa/hp_deskjet_3050a_ink_cartridges.pdf
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_529e00a3906446f0af31a1c94a4f11d2.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_off0000e8f3.bin
d18caab6be750f5f824dcc8fd4656bc255527a99e31256e34874bb77da21de6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 5336 bytes
font_01_sfnt_off0000fb24.bin
76229ebe321652eb8da76a2c6bf4beb463c7e8ad508b66d8a8e33c92cac0d1f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 11852 bytes

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