Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab8cac4c8756116…

MALICIOUS

PDF

71.3 KB Created: 2020-12-02 17:49:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3f01abf609943bcc45d48dbfbb069691 SHA-1: 75e70c96897b01cb3a7ce82cacd747b3c2d520fb SHA-256: 9ab8cac4c8756116a676625c5792c9464c8926720b9b4b925341a75873461150
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains and appear to be part of a link farm. The document body, though heavily obfuscated, contains text related to "Cisco networking academy final exam answers 2018", suggesting a lure for users seeking exam materials. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a scam. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://traffnew.ru/aws?utm_term=cisco+networking+academy+final+exam+answers+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391915/normal_5fa2f9839b979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5fb5c254f157c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403805/normal_5f93ee98b1a4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495385/normal_5fb4e431b372f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374369/normal_5fc418c27709f.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/godugosevokum.pdfIn PDF document text
    • https://rebanurox.weebly.com/uploads/1/3/4/4/134490941/2890030.pdfIn PDF document text
    • https://numokupe.weebly.com/uploads/1/3/4/8/134857704/fufixoperotemi_ruluvawigi_dowuvalixug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390055/normal_5f8f9f6b329e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_5f91279bdfec4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445570/normal_5fa1ea1534c20.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/fb76c71.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/1a96d497-a687-4961-9f3d-66d472af3732/vonekirubinopuzilosalog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce1dbac6-88ae-486c-a6a7-c7d543d1986e/kokapetibifoxezelup.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc002e7e5c7695ca996b6a8/t/5fc175ee5147b148046a93d7/1606514159830/fazokaxozonowari.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1fc5b08f4a0e8505cdfe/1606229958026/np203_transfer_case_fluid.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_off0000d731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD731 6092 bytes
SHA-256: 616687bee8bcfdc46c4bea0a97449d9e78cc5be87bfbcaa28ee142ad05347410
font_01_sfnt_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 10636 bytes
SHA-256: 79e11dba55f67cc982fb1de1187e802bd6bdad985faa40a370701d91f9cbfe99

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