Malicious PDF — malware analysis report

Static analysis result for SHA-256 9958a2115219e4eb…

MALICIOUS

PDF

78.9 KB Created: 2021-05-22 01:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d02e78a4941905fde43b64a24e42f212 SHA-1: 9e3078144d8279827e944b250bbe25c5e4c9da29 SHA-256: 9958a2115219e4eb888f088ca2ccade871a77f3e6d51d80a67e71e36cdac29eb
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 of which are hosted on disposable domains or cloud storage, suggesting a link farm or distribution point for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=how+to+pair+jbl+wireless+earbuds+together
    • https://tapulebuzaxu.weebly.com/uploads/1/3/0/8/130814605/mubisuke.pdf
    • https://peminikagi.weebly.com/uploads/1/3/1/8/131856713/6618858.pdf
    • https://nezovudaposuru.weebly.com/uploads/1/3/0/9/130969726/wudonasolapire.pdf
    • https://jomagikovire.weebly.com/uploads/1/3/1/4/131408086/ruxerax-soviparidal.pdf
    • https://famogapev.weebly.com/uploads/1/3/1/6/131606489/2332fca87.pdf
    • https://cdn-cms.f-static.net/uploads/4366987/normal_600c98fe7db94.pdf
    • https://tojalalegeb.weebly.com/uploads/1/3/4/5/134584715/padebefuximisovaji.pdf
    • https://cdn-cms.f-static.net/uploads/4450635/normal_602539bf1e2e4.pdf
    • https://dekodisiga.weebly.com/uploads/1/3/6/0/136051758/webagapedidu_zesidut.pdf
    • https://cdn-cms.f-static.net/uploads/4453329/normal_601e2b7e7ea93.pdf
    • https://cdn-cms.f-static.net/uploads/4391621/normal_605d66b154c9c.pdf
    • https://static.s123-cdn-static.com/uploads/4465264/normal_5ff3b89c194e0.pdf
    • https://rabexowubomisuw.weebly.com/uploads/1/3/1/4/131407155/9120b6cfc3b54f6.pdf
    • https://rewizefugubopu.weebly.com/uploads/1/3/4/2/134266162/xugojipesakifum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/megujobemegor/22697185580.pdf
    • https://s3.amazonaws.com/nitajosasa/92542712809.pdf
    • https://s3.amazonaws.com/rovuweraja/fisegupuroporexex.pdf
    • https://uploads.strikinglycdn.com/files/b20b3ce8-e5c9-43d5-9c27-83fc32635739/aprender_ingles_americano_101.pdf
    • https://s3.amazonaws.com/batiku/sindhu_bhairavi_song_free.pdf
    • https://uploads.strikinglycdn.com/files/a0b96c46-b796-485a-8186-107c43975f25/instruments_used_to_collect_data_in_qualitative_research.pdf
    • https://s3.amazonaws.com/gotitibekovi/solving_rational_equations_answers.pdf
    • https://uploads.strikinglycdn.com/files/3d0912d5-7463-46cd-b60b-72b79b63fe88/wefivagapaxuseg.pdf
    • https://s3.amazonaws.com/sorogamat/choose_the_correct_answer_inside_the_box.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f9.bin
dec45b7070fefd603de0bb6079d5f80419ffab98998deb5fa28dbed0fb33dbc3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 5488 bytes
font_01_sfnt_off000105a5.bin
2646d77877d52306c89594dd1afd69af983109573ab68db323b5429a74b83ef3
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 11432 bytes