Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe1ae1b7c436b42…

MALICIOUS

PDF

78.6 KB Created: 2021-04-02 21:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 76f512c9602b3b63c0d4d267c45aaa53 SHA-1: ceba1c910bf6d2108e585655220a8afcbd89bca7 SHA-256: cfe1ae1b7c436b4244263bc1cd14b5ace122dcdb43d45f07be9c83b7ff7b2799
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, which is a common technique for SEO poisoning or directing users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs suggests the primary goal is to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://resalured.ru/strik?utm_term=cute+where%2527s+waldo+costume PDF link annotation
    • http://winovigamaj.mygamesonline.org/5714675338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_605a72015da72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454299/normal_5ff9965e49a3d.pdfIn PDF document text
    • https://cdn.sqhk.co/tavanaru/fjghfhh/93807397935.pdfIn PDF document text
    • http://fegokodelaxen.scienceontheweb.net/gimumekepivotinugilenerag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505771/normal_605f8d63a7e6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420459/normal_5fcafe7d08e61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498882/normal_6008eb785f23b.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/dugudoxofugaporunerumoso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426424/normal_5fe7d793756fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381539/normal_5ffdc4583278c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446924/normal_6032ab13b6cdf.pdfIn PDF document text
    • https://cdn.sqhk.co/rapigufagi/dggegd2/sniper_movie_1993_cast.pdfIn PDF document text
    • http://wovoradomumakil.medianewsonline.com/xigemetixakanubesumed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453754/normal_6000f4ab391f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://padusij.onlinewebshop.net/76724124758.pdfIn PDF document text
    • https://aeedc83c-a41d-4179-9d48-e770e4c4cd47.filesusr.com/ugd/e010a7_72de86e05ebd4fe4aadac1a30bc2a42b.pdf?index=trueIn PDF document text
    • http://kimawawasero.onlinewebshop.net/juwisazimizetasesubexakul.pdfIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_319707c041b64d16843f711951e14e09.pdf?index=trueIn PDF document text
    • https://2e4b0ed6-c237-476e-b23b-7c95f147629f.filesusr.com/ugd/30e930_b24a7bcd763b4e0395fd83c9e3fb170d.pdf?index=trueIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_b06b7c47f2e642159289cabe7e15d235.pdf?index=trueIn 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_off0000f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 5208 bytes
SHA-256: 7e9ae33707e4708277d870a5126d46b3e7b28114c930b24dc4a63eeba9d97bfa
font_01_sfnt_off000107dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 10896 bytes
SHA-256: f8c00b6632f3e74492e9910f9faecad83106fcf60a38de474941f828c30855fb

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