Malicious PDF — malware analysis report

Static analysis result for SHA-256 7917bbf5b22e5282…

MALICIOUS

PDF

118.2 KB Created: 2020-11-14 10:36:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b76e455c485e53e65a9e87820e8553f4 SHA-1: 1cc198335e39c17856f349776a0e6c537f989aa4 SHA-256: 7917bbf5b22e528223eebc67cbe6c4ad9d56802712b61dbd4ffc6d123741c1f0
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one specifically to a known malicious redirector. This indicates a link farm or SEO manipulation tactic, likely intended to distribute malware or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/123?utm_term=characteristics+of+constructivism In PDF document text
    • https://vuxomikum.weebly.com/uploads/1/3/4/5/134587944/guzuzowewuk.pdfIn PDF document text
    • https://zilavexeredora.weebly.com/uploads/1/3/0/8/130874610/selinimafimigoto.pdfIn PDF document text
    • https://moxoviwepikiwu.weebly.com/uploads/1/3/2/8/132814726/9656980.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/83546.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/newixexetukewobuse.pdfIn PDF document text
    • https://bokixewabukogu.weebly.com/uploads/1/3/4/3/134341992/96e5965364fd.pdfIn PDF document text
    • https://gedaxafi.weebly.com/uploads/1/3/4/3/134340736/7f1b2af.pdfIn PDF document text
    • https://satobawugeg.weebly.com/uploads/1/3/4/7/134701522/f1ff107fcb.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
    • https://uploads.strikinglycdn.com/files/2aa41b05-0d59-47ae-b06f-9c5810bdaab5/49675109518.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/inception_definition_anatomy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd9d1c8a-8f69-4553-baca-9157bd2071d4/momaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19426c0e-49fb-4f48-aa06-f2173cdb722c/nanezedijizoxojowigufezep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8c1289-d4e6-4c8a-b904-7463864c3b48/91364581765.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000186f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186F6 5052 bytes
SHA-256: 062f7a4f5636312595b43be82f310469c740dfbb63e7b38a5399840254df7a54
font_01_sfnt_off000197fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197FE 11004 bytes
SHA-256: 21f168352269741c33fe4986e231232fbf181100bd3b7c6bec5862c3e804c748
font_02_sfnt_off0001bd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD7D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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