Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa6f75ef19f46d5…

MALICIOUS

PDF

70.3 KB Created: 2021-03-29 20:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6391aaec319e6b59953c1ec193f7d690 SHA-1: 740306b29cad50cec96bc5f1390bd9ecb6428fbb SHA-256: aaa6f75ef19f46d5d45eedadfab446880f00c22444821e700df3db5a82666f6d
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, directing to a suspicious URL. ClamAV also detected it as Pdf.Phishing.Trojan. The presence of embedded URLs and the ML classifier's high confidence score suggest a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to a roster, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/wix?keyword=linn+mar+football+roster
    • http://xupenirulavep.iblogger.org/kekutirubedulizovoboru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/35274876-4ffe-49c5-b51e-06eb6b946150/76530032330.pdf
    • https://uploads.strikinglycdn.com/files/ef660ce3-d5ac-4d6e-a148-169629f4a101/canon_mp250_driver_apple.pdf
    • https://s3.amazonaws.com/suxuzubojut/805819104.pdf
    • https://uploads.strikinglycdn.com/files/62333acf-1909-486b-b352-68cdfe2b7143/boss_ns-2_isp_decimator.pdf
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_75b1e856d2f74308b64be2ee452403c4.pdf?index=true
    • https://s3.amazonaws.com/gorajikunobixi/dirty_mind_puzzles_with_answers.pdf
    • http://jexuzutipeku.epizy.com/bengali_proverbs_english_translation.pdf
    • https://uploads.strikinglycdn.com/files/29e4863a-19f1-4860-99ad-9d1bc43fd7fd/how_to_prepare_for_a_small_business_loan.pdf
    • https://uploads.strikinglycdn.com/files/900a7d8c-a559-4988-bbb9-dcf1d0b18251/2962528328.pdf
    • https://s3.amazonaws.com/benubapopikaj/android_gmail_backup_photos.pdf
    • https://uploads.strikinglycdn.com/files/75643bf5-1429-4731-98fb-154410fc2a09/79210347908.pdf
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_0054809089a84872ab63276acf4e7dbb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/78120725-a836-4357-b025-84c0f9bceb28/78329724123.pdf
    • http://bewimovope.epizy.com/puxij.pdf
    • https://uploads.strikinglycdn.com/files/099da16b-8941-4a37-963c-29a7a96bda10/hp_1320_printer_driver_for_windows_10.pdf
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_79fafa8cdc14425db50743603769be18.pdf?index=true
    • https://s3.amazonaws.com/vovuzize/bosses_of_the_senate_worksheet.pdf
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_ea6ad741149d4f3a983ffc9694f81354.pdf?index=true
    • https://uploads.strikinglycdn.com/files/48ed6fea-79cb-4a5b-bfde-7991f872ffd6/lalafaposidudozuzorop.pdf
    • http://teputiresufe.epizy.com/5551986223.pdf
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_657980e4b7f94f77a9158166cecd80f9.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca01.bin
eaa8ee6ba6bcec2926bf759cf3347e00aead8c1cf6d9242ba2a9014e1bb45783		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA01 4780 bytes
font_01_sfnt_off0000da16.bin
7ed98459eaea8fa121de0ab17695af74417cf4b249dcffbf2009ef8a8c194dae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 10636 bytes
font_02_sfnt_off0000fd71.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 4324 bytes

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