Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cfd2a9a09f88c2…

MALICIOUS

PDF

76.4 KB Created: 2021-03-18 19:57:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fa60b76055cee6a2f44e2d094d2e7ba2 SHA-1: 38883c3d94402531cfb5f9794297f0764ffaf55c SHA-256: 55cfd2a9a09f88c2d53fab482e55fdf433b68961fcb2dbdea4c1e9eb647ebf12
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or a phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://resalured.ru/strik?utm_term=what+animals+have+tentacles PDF link annotation
    • https://xesofizagib.weebly.com/uploads/1/3/4/4/134491847/pubulunutolosafimig.pdfIn PDF document text
    • http://hookup666.site/gasolagazamogubatunuwik745.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448347/normal_5ffb1fa487f25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454988/normal_5fe5a581490d9.pdfIn PDF document text
    • https://lutigasudubuwa.weebly.com/uploads/1/3/2/6/132695203/rojowigukaf-wudejubas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482858/normal_5fea469228f07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500186/normal_602729fd54cba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502248/normal_5fcb2068b12f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_603c6a887ef14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463266/normal_5fcb9c8f19451.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450638/normal_5ff75588d4ad0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406223/normal_5fff27a6a1285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448724/normal_6033ee361cd27.pdfIn PDF document text
    • http://tixshopclub.fun/lakipijikujuoinn5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423429/normal_604ced37155c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371809/normal_603482378d8ba.pdfIn PDF document text
    • http://premiumpornclips.com/android_service_onstartcommand_not_called8l4ju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5683c959-9272-49bc-9174-af835ad16afb/how_to_open_a_nordictrack_treadmill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9707a1aa-113e-47c9-a809-17e5adc250aa/a_lesson_before_dying_sparknotes_chapter_13.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_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 5016 bytes
SHA-256: d8c86db7a6fdfc3ef9137a2dfc25cd4b3e39ba50f08d698fccdaeabc8fb11219
font_01_sfnt_off00010052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10052 10696 bytes
SHA-256: cf4724e254bc5d2e5eccd20ea2f39bf74b61bb6c4f3be3d8a983cd4814a42ea8

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