Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e9dea792fef139…

MALICIOUS

PDF

71.3 KB Created: 2021-01-02 13:06:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 78bd3dd947a20177831c5cf2c0789835 SHA-1: 6269e5456aa5ec1780bfd1f472c8305ef8c33a3b SHA-256: a1e9dea792fef1390b1df203b36e4b1c43182601b64d5315e0a544f3995cd375
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. The primary URL, 'https://trafffe.ru/aws?utm_term=mixed+addition+and+subtraction+worksheets+pdf', is presented in a way that mimics search results, likely to trick users into visiting a potentially harmful site. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=mixed+addition+and+subtraction+worksheets+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401723/normal_5fc5770606b97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418367/normal_5f9849951a988.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498868/normal_5fe02246e99cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368466/normal_5f99edab2d3e0.pdfIn PDF document text
    • https://pikotawikeju.weebly.com/uploads/1/3/4/4/134496208/6072037.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/474185.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5a3cc52c-48ae-4d24-aa8f-7d54f7aa29cf/2015_pals_provider_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/tn_2019_tamil_hd_movies_isaimini.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/76427015658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10fb31cc-b5dd-4a96-870c-996d3e336e25/3.2_cell_organelles_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/from_monogamy_to_polygyny.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/xevurapurosomelixaxegix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce84a12-fa89-4e06-82e2-d0af78d68839/49313041999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1084a4a6-3c21-4cf8-a7a2-13f1f960e812/xinedubuzop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE21 5460 bytes
SHA-256: 75d3fc1f8a34333fc145e1c768fd8ddd9016a321dc4064ec631088f45ece69e0
font_01_sfnt_off0000e0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BF 9740 bytes
SHA-256: 6718499ae3603ddaf6789d80193d883455691bc94083af03d88c4e45f6f92a89
font_02_sfnt_off00010213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10213 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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