Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8305f887b4ce29d…

MALICIOUS

PDF

74.1 KB Created: 2021-01-04 22:20:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 403ac75a020c7cc69a196ecb6de60eac SHA-1: 14569ca76804cc67e67adab141655835ebb9ee5e SHA-256: b8305f887b4ce29d4daa0d339259bbbc44e557377ded3320af9e2f16f057687d
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including critical alerts for linking to known malicious redirectors and hosting a link farm. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The numerous embedded URLs point to various disposable hosting services and a redirector, indicating a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/aws?utm_term=assassin%2527+s+creed+syndicate+hd+wallpaper+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4502248/normal_5fb65e3615d34.pdfIn PDF document text
    • https://warajepij.weebly.com/uploads/1/3/4/6/134608856/26686f.pdfIn PDF document text
    • https://lefaxujil.weebly.com/uploads/1/3/0/7/130739779/e2fe5337bd5d0.pdfIn PDF document text
    • https://gaxasexafarud.weebly.com/uploads/1/3/4/5/134590452/tadovexiripi_fuvesapa_sivoxew_nemabivutelu.pdfIn PDF document text
    • https://pawimugonuri.weebly.com/uploads/1/3/4/8/134882006/dagak.pdfIn PDF document text
    • https://losujawidejope.weebly.com/uploads/1/3/4/3/134310111/d4ccb9b253.pdfIn PDF document text
    • https://kobalogowitat.weebly.com/uploads/1/3/0/7/130776452/7768026.pdfIn PDF document text
    • https://lemevepavakupe.weebly.com/uploads/1/3/4/7/134701524/rawegiwatason.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9f2cb27-2bc4-4ec7-9227-0ac8c6aae0ba/sitoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73c25e53-f11d-4a34-989d-2c7727082e9f/darutobupaxugig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8af0410d-5ef5-4fb8-b2fc-dc79dcf33306/linogefuluv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acde50ff-5941-447f-95e6-4530c3b70509/centrar_texto_en_latex.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_off0000ce76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE76 5460 bytes
SHA-256: 3dbe04ad8e25ac9401e3585d123cc430b20de67df005859c8e8482dd41793c48
font_01_sfnt_off0000e121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 11080 bytes
SHA-256: 23639034c6a589b6d98d27793f4093f1685284d7deb6b878e6a4f787c76f11ce
font_02_sfnt_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 16164 bytes
SHA-256: d781c508aaf473e50263a6aabc3f4161b7fa10724c54bb8d35addee38a7f1c44

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