Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11884d81b97e141…

MALICIOUS

PDF

78.6 KB Created: 2021-03-24 05:14:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b55b7af4d2fdc58041bb660865d33a8e SHA-1: 432a6d2f36f26756fbc5ab39aa2845858cb4506b SHA-256: a11884d81b97e1419ef397c8056db49d62b8dc30c960bb68726060b322b55a04
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, a common tactic for SEO poisoning and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://xajibur.ru/award?keyword=balanitis+tratamiento+pediatria+pdf PDF link annotation
    • http://muxonobugimaki.22web.org/alagappan_medicine_7th_edition_free.pdfIn PDF document text
    • https://wetusaseri.weebly.com/uploads/1/3/5/2/135297966/rufemozufebexan-tovomawezawofu-jurof.pdfIn PDF document text
    • https://jeralizijofuki.weebly.com/uploads/1/3/4/7/134710598/8023118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477638/normal_6014699fdd0e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_60300afa35f24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_67c369d1daa8460d82c7b5b855393744.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/frantz_fanon_quotes_on_revolution.pdfIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_0906385f2eea4448ab9150d9f87b3af2.pdf?index=trueIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_07e286cc3e094db085dd8b3788cb86c7.pdf?index=trueIn PDF document text
    • http://zufonokimilije.epizy.com/waxadedabavanejabe.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/borderlands_3_ps4_pre.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/bayalu_daari_movie_songs_free.pdfIn PDF document text
    • http://xuxuripose.epizy.com/78144068376.pdfIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_5ab36eff39c74882a2db1207298adf1b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jinabom/android_gamer_wallpaper.pdfIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_49061b69a6dc4df9bdf69a988175c9ec.pdf?index=trueIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_f77c10be93674e28be1795e5212619db.pdf?index=trueIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_2972a300543842f582ab9c22ff11da26.pdf?index=trueIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_f729888e1b4a46cabe338d25f0d01bf0.pdf?index=trueIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_3542e04454254684b18536e48f48bef5.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 5236 bytes
SHA-256: 7adbe71af446c70b813b7e5f4ca2c8a65f78a015362d0f5852521858c53cce8e
font_01_sfnt_off00010364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 12544 bytes
SHA-256: b480b54affb17a3f3bfc6fb3bf1e5b6fc0d42ce24ff9193e4864bd28eec1a5f8

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