Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cef2f2326e8d972…

MALICIOUS

PDF

93.1 KB Created: 2021-02-08 19:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c3c8912b7c4ae724bfe2f561ee9b5532 SHA-1: 13f6a3f6cb4e3dd636c6cd40465c4d5d2c208fa3 SHA-256: 0cef2f2326e8d97244f8802e8da0e4091678560124bffa746bb6dcf50044ea58
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to other PDF files hosted on various domains, indicating a link farm or redirection scheme. The primary URL, https://bologen.ru/123?utm_term=fresno+state+engineering+scholarships, suggests a potential phishing or SEO manipulation tactic. No scripts were extracted, but the presence of numerous external links and the high detection scores point towards a malicious intent, likely related to phishing or distributing further malware.

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
  • 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://bologen.ru/123?utm_term=fresno+state+engineering+scholarships PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380214/normal_5fd136245843d.pdfIn PDF document text
    • https://raguwagoneneza.weebly.com/uploads/1/3/1/3/131384547/damakoti_xuzan.pdfIn PDF document text
    • https://jotinebemoti.weebly.com/uploads/1/3/4/6/134681432/tesudutebi-lutex-gepuwen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_6020893ec2297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471273/normal_600f430ed1a27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443804/normal_6004ebf61dfe6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449392/normal_60055209dfeaa.pdfIn PDF document text
    • https://gilaxisob.weebly.com/uploads/1/3/1/4/131406303/seduzerilana.pdfIn PDF document text
    • https://woxigixekamut.weebly.com/uploads/1/3/0/7/130739530/nawivuju-gevajazidula.pdfIn PDF document text
    • https://duketexu.weebly.com/uploads/1/3/4/7/134725944/262c0f80ef167bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425760/normal_600833cd549b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484156/normal_5fe4184ccf870.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499285/normal_5ffe0957ed37f.pdfIn PDF document text
    • https://gororumemi.weebly.com/uploads/1/3/4/5/134517819/3c8ac2024b810c.pdfIn PDF document text
    • https://nolulanulupu.weebly.com/uploads/1/3/1/3/131379612/5514603.pdfIn PDF document text
    • http://apsdd54gfv.xyz/poesie_l_ecole_de_maurice_caremeklv2v.pdfIn PDF document text
    • https://sufupixugopibo.weebly.com/uploads/1/3/5/3/135316623/30463.pdfIn PDF document text
    • https://gekanabedo.weebly.com/uploads/1/3/4/3/134318260/6063328.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415527/normal_5fca07fe5ed37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462976/normal_5fcb2dab6ca52.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 4940 bytes
SHA-256: e45f6e3529d35dc84f6a082ecdd13df2fb3db39b66776f2432dfece5e4903a2d
font_02_sfnt_off00010505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 6200 bytes
SHA-256: a9cc984849cbaa46e515728cda2a05c558ef6df5e91745503e879b0ffc1a7d74
font_03_sfnt_off00011a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A88 11292 bytes
SHA-256: 6d858a25404f50dff6f487e6cdc922f04fbd4d31b79b2cb978673c7504a2e3aa
font_04_sfnt_off00014136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14136 16664 bytes
SHA-256: 3cd7be7af4f3f1f2983dbf796be88ad4ed2209ed33ecf4a0113f2fa18b36528a
font_05_sfnt_off00015789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15789 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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