Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d0138691ec7842…

MALICIOUS

PDF

65.4 KB Created: 2020-11-21 09:20:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fd4f6331b88dd0b06a0dc7083dad5874 SHA-1: 1b096414188b4c894f773599ef2095315a5ae120 SHA-256: 55d0138691ec78429b881bfe1b93133d9039f0375cc25318963b59623a7a32c3
214 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to what appears to be a link farm designed to redirect users to malicious sites, as indicated by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=molecular+biology+techniques+third+edition+a+classroom+laboratory+manual+pdf In PDF document text
    • https://zozilevijuni.weebly.com/uploads/1/3/1/3/131383476/8811783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_5f9f10fac82fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417669/normal_5f9eef4322fc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379241/normal_5fb2df1f62a8a.pdfIn PDF document text
    • https://noginoludaven.weebly.com/uploads/1/3/4/3/134374582/gesagiviribitazetu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375909/normal_5f92a9663d8b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/48129323578.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/ark_angel_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/metot.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/ascend_d10_kayak_price.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/digotifipusirowezix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a962d6-b8ed-47dd-8da6-e8243121224f/lange_clinical_neurology_and_neuroan.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/32718420132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2732d6b-ccca-4c19-b190-149cc8e05374/22094735662.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/opposite_of_brown.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/2917818696.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_off0000c0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A2 5944 bytes
SHA-256: 71617d0f0c6993f1c334a8120f9f7cb67fc0a71762e5ce7e60787ed1e778850e
font_01_sfnt_off0000d4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B6 10356 bytes
SHA-256: 4d10b0fa6341520335b5a5c50eeef50c5455d3697d2b66d5de93d466c9ba8e9c

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