Malicious PDF — malware analysis report

Static analysis result for SHA-256 76873ba1aebf5532…

MALICIOUS

PDF

72.9 KB Created: 2021-02-18 14:54:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a3c24263c5b00caf6820f00b1f4e7ed1 SHA-1: 36def83cb14df26170abb3c6ee659da072ad3cd3 SHA-256: 76873ba1aebf5532a20f32ccafcc50e65e9180c959796ac1add1e13bdfc4d669
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, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content.

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://maypoin.ru/123?utm_term=what+are+basic+life+skills PDF link annotation
    • http://tujofuzenej.iblogger.org/hortonworks_installation_guide.pdfIn PDF document text
    • https://mubuzetuwifo.weebly.com/uploads/1/3/4/7/134703000/regosutok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408479/normal_5fcb21573939b.pdfIn PDF document text
    • https://verijijul.weebly.com/uploads/1/3/4/8/134861220/3cc6f27931ebc6c.pdfIn PDF document text
    • https://juwufugoxeza.weebly.com/uploads/1/3/4/5/134528381/37373b16d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367920/normal_5ff3c1b1573a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414849/normal_5fcb2dd47ef3f.pdfIn PDF document text
    • https://sufixekanol.weebly.com/uploads/1/3/4/7/134712322/kavopebaduvo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482424/normal_5ff5130c24fb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457572/normal_6010047a004f5.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/dudurat/comali_cut_songs_isaimini.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/windows_server_2016_updates_slow.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/97100349076.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/any_admin_3._6_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/the_reporter_online_lansdale_pa.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/najobuwokip.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/zevadiluxoxisolariletiv.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/guess_the_lyrics_quiz_with_answers_2000s.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_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 5184 bytes
SHA-256: 8b0b70f032d180a9b97626b7332d9825e4e43d23b2899e593c7a34e39e8ade35
font_01_sfnt_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 10200 bytes
SHA-256: 3c5e119bac85bd707bf4969b16d0fe80301d3c81b476fafca63eb76ce5a86871

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