Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5387c5037192a46…

MALICIOUS

PDF

78.2 KB Created: 2021-01-25 11:06:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 74e009fd4dadf70bf34ad64e495dfb99 SHA-1: 11b4fc1563a82284e1a5b74f91d27010b045c16b SHA-256: e5387c5037192a46dd910dc925fe2b80f522a1ac6a54e9b4561fd118aa2fad29
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on link farm domains, suggesting a SEO poisoning or traffic redirection scheme. The embedded content, though heavily obfuscated, likely serves to facilitate the redirection to malicious URLs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://trafficel.ru/123?utm_term=how+to+cite+the+bible+harvard PDF link annotation
    • https://temizugejifo.weebly.com/uploads/1/3/1/3/131384470/puwakoniboguj.pdfIn PDF document text
    • https://jedagafigi.weebly.com/uploads/1/3/1/4/131438055/visolegezopupuwunu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366305/normal_5fcecc1b44542.pdfIn PDF document text
    • https://mazokameviseg.weebly.com/uploads/1/3/5/3/135349474/a4104a41aa5.pdfIn PDF document text
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/1c9a5a4e3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374700/normal_5fe3ed9299b7e.pdfIn PDF document text
    • https://bazuxenulasiv.weebly.com/uploads/1/3/0/7/130740357/lusifeginipap.pdfIn PDF document text
    • http://kiwirixup.22web.org/am_pm_time_format_in_c.pdfIn PDF document text
    • https://pudesuvake.weebly.com/uploads/1/3/0/9/130969082/jisefuzujum.pdfIn PDF document text
    • https://xitolomeka.weebly.com/uploads/1/3/4/0/134012462/8169696.pdfIn PDF document text
    • https://pugulewex.weebly.com/uploads/1/3/1/4/131406013/lanukinadal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454967/normal_5ff65752485fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487894/normal_5ff03f6605977.pdfIn PDF document text
    • https://dibasipelop.weebly.com/uploads/1/3/0/7/130738559/vitow_kuvunununaku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369512/normal_5fca396728731.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/bokelur/google_chrome_64_bit_win_10.pdfIn PDF document text
    • http://wivifizurata.epizy.com/36012572947.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12C 5100 bytes
SHA-256: e2733f3858d896dad327bed2fa2c953ef337dc4c1dd9be0a02640eefd0ea9a47
font_01_sfnt_off0000f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 10576 bytes
SHA-256: f57245eb7b0b98e1a2a994e15a1c21954f1dd0d46e0db0ea12942ad7fedf14c5
font_02_sfnt_off000116b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B1 16144 bytes
SHA-256: f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29

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