Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a14be098568bd6…

MALICIOUS

PDF

83.6 KB Created: 2021-03-09 23:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4db9254dcdb544c74c52612680f4f9df SHA-1: b0b6d3191eef5ce62db3634514eb4ace89d21f76 SHA-256: c8a14be098568bd6d83bf57f002a7be3956d6bae7aaeab03a290f8519f5d937b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external links, with one prominent URL pointing to a site offering 'cipher android decryption', suggesting a phishing or malware lure. The presence of embedded links and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/123?utm_term=cipher+android+decryption PDF link annotation
    • https://siwevamad.weebly.com/uploads/1/3/1/8/131871433/sixedotasumu-nagizevumeb.pdfIn PDF document text
    • https://maludanojuwido.weebly.com/uploads/1/3/4/5/134591959/4662641.pdfIn PDF document text
    • https://xexajuxeleseg.weebly.com/uploads/1/3/4/5/134592224/022084ddb.pdfIn PDF document text
    • https://xukunuwemixul.weebly.com/uploads/1/3/1/3/131384589/xalelenitiwasa.pdfIn PDF document text
    • https://sazulolako.weebly.com/uploads/1/3/1/4/131453808/8119490.pdfIn PDF document text
    • https://buzixigadojaw.weebly.com/uploads/1/3/5/3/135316262/fotasanigobej-fijur-wubiwenaj-bimikiwe.pdfIn PDF document text
    • https://lotefexikig.weebly.com/uploads/1/3/4/0/134097130/8a2a84409fe2d22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_8c3a2f426765455ab08f9579db3251b9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/learning_spanish_like_crazy.pdfIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_50bdcd95fda842eb959aa35e372b91ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a691ade8-df0a-420f-a0c0-d8f4f162e8dd/abu_garcia_pro_max_10.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_19182717a4524605aba33e702c68b6a4.pdf?index=trueIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_16fae351a86f4928bed890e9f03dd0dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/benutuxugewodufawulomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e990ea-e652-4a30-bef6-9b12be38660e/yaskawa_v1000_manual_tecnico.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/ribedoruvudunogunanuwisez.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/biblia_reina_valera_actualizada_apk.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_370970d2bc0742289b0c3df5e4241e7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vutame/classic_media_player_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/35607436189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecfbfb91-baed-439c-9313-2a51232a546a/rubikagudugu.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_off00010a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A13 4960 bytes
SHA-256: eff7f88e92d8fcffea5e099824d203d3535b23251daab5a517ba923a83f65626
font_01_sfnt_off00011af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 11080 bytes
SHA-256: c85a985d87c0f4034ed1846354fe542dfae1b28fac38f10cb906c6ca13e55193

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