Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3b179890d2860c…

MALICIOUS

PDF

131.1 KB Created: 2021-01-02 15:36:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7d93543007fccde8a8185988e89672c2 SHA-1: 7063315fae685878907d322e92219b7e0107f16f SHA-256: 9d3b179890d2860c5114b80cbd5c7ebc8ef4b981d8253d363f91d52e666a8d55
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers also flagged this PDF as malicious, specifically a phishing trojan. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious or deceptive content.

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://trafftec.ru/aws?utm_term=aldea+global+concepto+pdf PDF link annotation
    • https://xisudujerixaxir.weebly.com/uploads/1/3/4/5/134583325/xisolajagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465398/normal_5fbb4df98047b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391302/normal_5f959b0374814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386618/normal_5fac56cbba580.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/sizimo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408174/normal_5fc84ddea0e24.pdfIn PDF document text
    • https://jigejoxipivigif.weebly.com/uploads/1/3/4/7/134731155/kolepubitalav.pdfIn PDF document text
    • https://tofuxatedev.weebly.com/uploads/1/3/4/7/134706151/xamimusikedalovute.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/yghzJib/tarijagavowatoruf.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/6335a0a8-0341-47fe-90f3-c6ba1141972b/wordpress_manual_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/72742899853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a775daa-48ee-49cf-98fb-acf37b1f1fe6/rogoginow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/419d0b0a-b1a3-4c74-b244-879b88da847b/plastic_texture_pack_1._13.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89fe730-4db5-4b75-a06f-9b7a3863f807/calligraphy_practice_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/sobajabarujoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21be0fab-d57f-4290-85d6-6f2b251bc1be/sayumi_michishige_images.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_off0001c3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3D3 5180 bytes
SHA-256: d9b16b258435e873c08386803f019468acc9110e67a00fb6ac416b777db15601
font_01_sfnt_off0001d58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D58C 12644 bytes
SHA-256: eec03f9f133bb198b91393b4b0f3cc099826b8a61fb2289b5f819004511c1449

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