Malicious PDF — malware analysis report

Static analysis result for SHA-256 b962152a91fcf2e9…

MALICIOUS

PDF

73.5 KB Created: 2021-02-11 15:41:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e303862b3f611662f642dfeb797313de SHA-1: 8d21670107937999700111ce79c061bc9f3f054d SHA-256: b962152a91fcf2e9795a6d4522712ebc468da242371c51e8ddf32a088a7ac06e
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, suggesting a phishing or SEO manipulation scheme. The embedded URLs, such as 'https://maypoin.ru/aws?utm_term=birds+sounds+ringtone', are likely part of this malicious infrastructure.

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://maypoin.ru/aws?utm_term=birds+sounds+ringtone PDF link annotation
    • https://bujubemido.weebly.com/uploads/1/3/0/7/130776032/8211578.pdfIn PDF document text
    • https://dozajumeguru.weebly.com/uploads/1/3/1/3/131379069/jobemuwufux_pafevox.pdfIn PDF document text
    • https://roxomikanu.weebly.com/uploads/1/3/0/8/130873860/2040048.pdfIn PDF document text
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/cfa4de1.pdfIn PDF document text
    • http://idealslim-ordina.site/19129733342mngin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408479/normal_60194f2025ee1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416490/normal_5fdf741c007ba.pdfIn PDF document text
    • https://peliretoru.weebly.com/uploads/1/3/3/9/133997281/1906312.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485929/normal_60017d0e0a76d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_601df8645e6ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/sewegujifeni.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/baazigar_o_baazigar_remix_song.pdfIn PDF document text
    • http://xorabaza.rf.gd/nios_marksheet_image_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/peaky_blinders_episode_guide_series_5.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/bernoulli_s_theorem.pdfIn PDF document text
    • http://kikasipab.epizy.com/watavi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AE 4680 bytes
SHA-256: 09e13772f63325ca8dddbc21c4f83a5a1955d1e58f9d1761c75071e17da40a7e
font_01_sfnt_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 10384 bytes
SHA-256: 0b836da992515701e8d7fc793e1c6ce43e4454a0adb357bd6fdadd1b35c1f925
font_02_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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