Malicious PDF — malware analysis report

Static analysis result for SHA-256 5421d317915a0aee…

MALICIOUS

PDF

77.1 KB Created: 2020-11-13 09:23:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 408cc1b563348eb47c42d1580b416c83 SHA-1: 5a849579919e17cd81761d739ef411f5b61293e9 SHA-256: 5421d317915a0aeea6abe188d66597d44bd3bbb7e163cc026aab5585b9538f7e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or redirection scheme. The primary URL, https://traffset.ru/123, is likely part of this malicious infrastructure. The presence of embedded JavaScript, though not fully detailed, indicates potential for further malicious actions.

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://traffset.ru/123?utm_term=stick+on+bifocals+near+me PDF link annotation
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/007c954f90.pdfIn PDF document text
    • https://jugoruzaja.weebly.com/uploads/1/3/1/4/131407370/vosatewibofapuju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5f8fd955d3e17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453336/normal_5fa35f8fefd6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374522/normal_5f90ec67c6ea9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411682/normal_5fa804a1e8ba2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447640/normal_5f9f2c937ef44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416653/normal_5fa55953e8d53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_5f935c6f9e70b.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/kupubeluxubajo-fadapu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d84e30a1-cf5b-4905-976a-ca22ec8cc2d0/mukunuxujavufawevaju.pdfIn PDF document text
    • https://s3.amazonaws.com/fulomufimikim/45492646470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b790af02-8ca8-4127-8e3e-328283191b68/zevedinagumiluxedola.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_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 5332 bytes
SHA-256: 302c723fe658d385292d0d5a38605babd85896e12b40781bd868685c91206d5d
font_01_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 11292 bytes
SHA-256: 9106c1899f4af0ed4809697c994728ffc986ac5d0534a90255bb4643dba21370

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