Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5cbc78a058c390d…

MALICIOUS

PDF

76.6 KB Created: 2021-03-02 18:53:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 9be47d1f8a65cd8f2826055ccc516236 SHA-1: 1a6c6f333382f71317af9ea30fa1258060edefcf SHA-256: a5cbc78a058c390d519959b77980389b79ae2cd412632f8dcbe9866d04c3e98f
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded URLs, forming a link farm, and one of these URLs is identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but no direct instructions or executable content were found within the readable portions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=do+polaroid+onestep+cameras+need+batteries In PDF document text
    • https://static.s123-cdn-static.com/uploads/4414174/normal_5feb40c3f27be.pdfIn PDF document text
    • https://kaxojolomo.weebly.com/uploads/1/3/4/8/134885197/mamaro-tebuxugu-wazepo.pdfIn PDF document text
    • https://lidukawovov.weebly.com/uploads/1/3/5/3/135323160/86744b934b05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_5fdbea7cc474e.pdfIn PDF document text
    • https://lefiletigej.weebly.com/uploads/1/3/4/5/134597596/2a9a3.pdfIn PDF document text
    • https://ruloxewetufo.weebly.com/uploads/1/3/1/1/131164393/59d0bce8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481673/normal_5fd1e248454c0.pdfIn PDF document text
    • https://buzoraxuv.weebly.com/uploads/1/3/4/3/134366179/061f3.pdfIn PDF document text
    • https://rujizubag.weebly.com/uploads/1/3/0/7/130776042/62b5292780.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366956/normal_5fed81e76afbe.pdfIn PDF document text
    • https://zevakevo.weebly.com/uploads/1/3/5/4/135400716/546971.pdfIn PDF document text
    • http://zojulosopejozaz.iblogger.org/80516984894.pdfIn PDF document text
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/8db884e2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424666/normal_60049f88a595f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414514/normal_5fdd76ed46fdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505839/normal_6001277a2c509.pdfIn PDF document text
    • https://dibexawalezi.weebly.com/uploads/1/3/4/7/134760597/bibukugi_wajitaji_xasubuvenubo_musemovomafizu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495413/normal_5feeee6f906cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369653/normal_5ff6817f39047.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475219/normal_5fcca1f4063f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428329/normal_6022ecbfd0f13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buvumitibeve.rf.gd/meesaya_murukku_movie.pdfIn PDF document text
    • http://gobofitis.epizy.com/kilemewotitisuriwesinoni.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_off0000ee05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 5356 bytes
SHA-256: e512d9b705a3c77e1048e1e0c378cf969a63177e8658ea460733b9a49569ec9b
font_01_sfnt_off0001001e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001E 10656 bytes
SHA-256: b1de1c1cf4b053a35cca8f2dd9da125156e597dfba70d8fc362bc603fb215fe8