Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a8f1bd8aabe182…

MALICIOUS

PDF

74.0 KB Created: 2021-02-26 14:03:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9b61ce9dd0cf9d2edec660b8393c76dd SHA-1: 329c56180da8c0b8fba53ec5981d4ccfcea4a04e SHA-256: 44a8f1bd8aabe182e9d5c8b39a54a12f7a4302521f168774c5a10d1f4472929b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, many of which point to PDFs with numeric slugs, indicating a link farm for SEO manipulation. One of the primary external URIs, 'https://midufefew.ru/wb?keyword=link%20belt%2060%20ton%20crane%20load%20chart', is flagged as unknown reputation, suggesting a potential malicious destination. The ClamAV detection and ML classifier strongly indicate malicious content, likely a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://midufefew.ru/wb?keyword=link%20belt%2060%20ton%20crane%20load%20chart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449990/normal_60228a05e2667.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460263/normal_5ff4b0d2e7d49.pdfIn PDF document text
    • http://venatavokawudo.iblogger.org/mofetivolotekezi.pdfIn PDF document text
    • https://fezuwarojeti.weebly.com/uploads/1/3/1/3/131383544/tesibuje_bujawumoj_ruvir_widavewajaz.pdfIn PDF document text
    • http://kibiwoki.iblogger.org/employee_engagement_survey_poster_template.pdfIn PDF document text
    • https://cdn.sqhk.co/waxigapo/haiagZp/large_photo_collage_wall_frames.pdfIn PDF document text
    • http://tb-films.ru/79449456294n2v3t.pdfIn PDF document text
    • https://rofozewoguse.weebly.com/uploads/1/3/1/3/131384025/fipebexidubu.pdfIn PDF document text
    • https://fataleripe.weebly.com/uploads/1/3/0/9/130969718/negenuwumusudik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427077/normal_6026243a8640d.pdfIn PDF document text
    • https://fuvetozexogix.weebly.com/uploads/1/3/0/8/130874326/5183177.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/dufekifaral/97222785585.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/4603159783.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/96056094108.pdfIn PDF document text
    • http://nopilire.rf.gd/allcast_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/76100096837.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_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 5292 bytes
SHA-256: 6e779fa78e9dd9fe2bdc5b3e525ed2de661f7fd5277b36a60458f3d1f0ca467c
font_01_sfnt_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 12368 bytes
SHA-256: fe44cbe57e3597758cf46b7175fc116be885b6a78fbb767863d959576e4e6981

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