Malicious PDF — malware analysis report

Static analysis result for SHA-256 1148a09823547587…

MALICIOUS

PDF

86.9 KB Created: 2021-02-04 05:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 546d456adb6e94fe219f9112ed529fce SHA-1: c80166b1c7a7dd287d911298a6fe130c377af504 SHA-256: 1148a09823547587961096bfde53a1cbe28aacffa87198e0d1c9266e7fa6a003
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning or phishing, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure for a manual, which is then linked to a large number of external PDFs, some of which are likely malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://seumenha.ru/wb?keyword=manual%20chevrolet%20tracker%202001%20espa%C3%B1ol PDF link annotation
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/214157.pdfIn PDF document text
    • http://busforpay.online/xivikaxusosulavolifgtpa.pdfIn PDF document text
    • http://xplaintome.ru/73083249899eybf1.pdfIn PDF document text
    • http://werenntaq.online/22966611906sh91y.pdfIn PDF document text
    • http://look-hotel.com/swot_analysis_ebook59xvt.pdfIn PDF document text
    • http://goodik.fun/wound_care_guidelines_2020t2jmv.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/brodersen_unic_xmwtfq4o.pdfIn PDF document text
    • http://sdek-24.cc/videmazubola2cc2r.pdfIn PDF document text
    • https://mixasokuxorizu.weebly.com/uploads/1/3/4/7/134742222/tuzefikuz.pdfIn PDF document text
    • http://sayfelengs.space/37433934089gxlgd.pdfIn PDF document text
    • http://betmoy54.com/wedding_makeover_salon_spaybmcx.pdfIn PDF document text
    • http://yoga-italy.space/vafefivibubibegexefcg6o.pdfIn PDF document text
    • https://xidifapub.weebly.com/uploads/1/3/0/8/130873728/2747625.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/finojethzft6.pdfIn PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/pesal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/elementary_medical_biophysics.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/beginning_sound_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/30384396531.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/63408305857.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/tirevikedowivuwaxemopare.pdfIn PDF document text
    • http://balubusepebibi.rf.gd/java_7_x64_offline.pdfIn 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_off000111fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FC 5688 bytes
SHA-256: 2cfc3114f4dd045f9e389ee2472bd4bc2e123d9c2dc1b40f4e6b443fefdbc44c
font_01_sfnt_off0001251f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251F 11896 bytes
SHA-256: f9e002cbdee7b4a24641931d6781923d0f3a22b4a80d233f32d60c8c3a0410e8

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