Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0fd00c5a50d1ae…

MALICIOUS

PDF

79.6 KB Created: 2021-05-27 13:40:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47f605816d9d5e9223cb8af218cec196 SHA-1: 2473addfdc3028265d761ae093650acdf180648a SHA-256: 5c0fd00c5a50d1aebff69e4cdad1fa075c01047b0b748057e52a2078bad98751
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, pointing to potentially malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=henretta+apush+textbook+online+pdf
    • https://jowiroluka.weebly.com/uploads/1/3/4/3/134336896/binudi_pojuzega.pdf
    • https://tekujutiwud.weebly.com/uploads/1/3/4/2/134234893/531150.pdf
    • https://static.s123-cdn-static.com/uploads/4460263/normal_5fe43852dfada.pdf
    • https://static.s123-cdn-static.com/uploads/4480878/normal_5ffe290f19ade.pdf
    • https://cdn-cms.f-static.net/uploads/4500911/normal_604513fc9f620.pdf
    • https://cdn-cms.f-static.net/uploads/4366011/normal_6012988b4d36d.pdf
    • https://static.s123-cdn-static.com/uploads/4471703/normal_5ff3f2d9944f8.pdf
    • https://static.s123-cdn-static.com/uploads/4415769/normal_60086f9a99f79.pdf
    • https://gitapobukelagij.weebly.com/uploads/1/3/4/2/134266265/sumenigorezeredur.pdf
    • https://static.s123-cdn-static.com/uploads/4382631/normal_5fcbaaf8cce54.pdf
    • https://cdn-cms.f-static.net/uploads/4484169/normal_6052ced71d7ee.pdf
    • https://cdn-cms.f-static.net/uploads/4448328/normal_602a00b0b5d69.pdf
    • https://cdn-cms.f-static.net/uploads/4471946/normal_60165f8628048.pdf
    • https://cdn-cms.f-static.net/uploads/4488332/normal_6039f8a09d05e.pdf
    • https://cdn-cms.f-static.net/uploads/4490001/normal_600a91acd826c.pdf
    • https://cdn-cms.f-static.net/uploads/4500897/normal_60511c821c95f.pdf
    • https://cdn-cms.f-static.net/uploads/4481418/normal_6026dd1667e44.pdf
    • https://cdn-cms.f-static.net/uploads/4503309/normal_60150d4b83387.pdf
    • https://static.s123-cdn-static.com/uploads/4406777/normal_5fcefe86154c0.pdf
    • https://gukusabijimesop.weebly.com/uploads/1/3/4/7/134761354/xujep-mevutu.pdf
    • https://cdn-cms.f-static.net/uploads/4380681/normal_600d33e8e07cd.pdf
    • https://static.s123-cdn-static.com/uploads/4370092/normal_5fc596ff90156.pdf
    • https://static.s123-cdn-static.com/uploads/4418013/normal_5fefd224bd2fd.pdf
    • https://cdn-cms.f-static.net/uploads/4413225/normal_606c93dfc370f.pdf
    • https://cdn-cms.f-static.net/uploads/4497395/normal_604d18e1b716a.pdf
    • https://cdn-cms.f-static.net/uploads/4422144/normal_60296334e1d42.pdf
    • https://cdn-cms.f-static.net/uploads/4476766/normal_60159f613009e.pdf
    • https://vapomawuwe.weebly.com/uploads/1/3/1/3/131398268/retigusumus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f875.bin
d0c168386a0203337717cb108b31633438813d6c7032bd1ac42b5c345de142f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 5360 bytes
font_01_sfnt_off00010aa1.bin
ca1389aa0b468645f5eec0b4b1a87ae4cb34ffbe9ad9c32632c25fd9d9c57220
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 11316 bytes