Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8435d94558ebe38…

MALICIOUS

PDF

103.4 KB Created: 2020-12-10 12:52:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f7e35c5b4ccd1dacd60e53265c701e4f SHA-1: 00da3cd97435c5514b5556fe11191182d7e8e975 SHA-256: d8435d94558ebe38eb882fce2e79df4aa9ae894348781ddcce368321db0eeaf7
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 redirector infrastructure, indicating a link farm designed to lure users to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs are the primary indicators of malicious intent, likely serving as a distribution mechanism for further compromise.

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
  • 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://ggtraff.ru/wb?keyword=alberta%20bc%20snow%20report In PDF document text
    • https://jowakalol.weebly.com/uploads/1/3/4/4/134480841/vetatijonel-dojuxisegu-dizuzomaxajifaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445739/normal_5fcd8d242d01b.pdfIn PDF document text
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/2378226.pdfIn PDF document text
    • https://dowezepuxaku.weebly.com/uploads/1/3/4/4/134463959/4509b874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5f8b649204613.pdfIn PDF document text
    • https://segelibuvak.weebly.com/uploads/1/3/4/4/134451144/texarewevo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f86fea03154f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387921/normal_5f92269bee79b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376088/normal_5f97afb6e8729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_5f8f5be6b5724.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457330/normal_5fb744b9a620f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc292fabda9c57a97c8d54c/t/5fd1de37a9eaf43bd85692c1/1607589432507/zegilovirigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d8ba1a4-65e7-4bd8-8b90-13b8de2c0813/cdc_definition_of_abortion.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc67aea084698658e84b086/t/5fd1f40eef89ac66837a3bfe/1607595026709/koradusopukuxalomokafoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30d4cd59-3916-4341-bff6-5637497058cc/kujemivum.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_off0001573d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1573D 5148 bytes
SHA-256: fdeb48b695b74aeb78968de64d8a0785e3a1bffe949b127205f25167fffcf1d9
font_01_sfnt_off000168d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168D9 11708 bytes
SHA-256: 64c1d5db322f5fc6ddb7163e6d75ed3c8a51b50b7705a8562f505eccee30db2a

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