Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6d0de0a43921f8…

MALICIOUS

PDF

73.2 KB Created: 2021-02-22 23:50:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1e26ab29c49b57b816fcbaaafb2f6b08 SHA-1: e487bd356f684a8999d99969dca0f5a4d5922aa4 SHA-256: 2a6d0de0a43921f80746d70572f2b554817a2c077cb9a1e135243e9c868b5815
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, with one pointing to 'https://crophysi.ru/strik?utm_term=how+to+clean+out+the+bissell+little+green'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crophysi.ru/strik?utm_term=how+to+clean+out+the+bissell+little+green PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379384/normal_60248f0f8d7f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482854/normal_6023cf76a976f.pdfIn PDF document text
    • https://wumefabifu.weebly.com/uploads/1/3/4/8/134888429/9f7f3b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501482/normal_5fc648044b5a4.pdfIn PDF document text
    • https://fiwarurebel.weebly.com/uploads/1/3/2/8/132814972/jurik-witagafu-ponosenil.pdfIn PDF document text
    • https://tebojizo.weebly.com/uploads/1/3/1/4/131406069/nuganuzavabi_zoxoferifami_xugepog_ruvukepojoza.pdfIn PDF document text
    • https://negijozizur.weebly.com/uploads/1/3/0/7/130775009/poguwap_bopeniwane_verozuzi.pdfIn PDF document text
    • https://zodekunomaxuj.weebly.com/uploads/1/3/0/7/130739112/40ec5604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408862/normal_601fa2d49fb04.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/bubeto/34949683344.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/telugu_ringtones_all_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/88595055418.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/how_to_write_a_nutrition_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/18815701253.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/nogelomedug.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/17_united_nations_sustainable_development_goals_sdgs.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/burra_katha_songs_naa.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_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 5252 bytes
SHA-256: df474f926020f96efa00fa35889f9559529587da57b5c9538d87108a963b5cf2
font_01_sfnt_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 11220 bytes
SHA-256: cfcefc51478068b516c021e5a8c1a8447e064b9b7365485b761315312ee1ec1c