Malicious PDF — malware analysis report

Static analysis result for SHA-256 3958611de42747b4…

MALICIOUS

PDF

66.5 KB Created: 2020-11-24 18:11:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 719fb9c8c193d79e1489c2ae7e6f191b SHA-1: 1bdff1fa8a5befaf9d95b05708c0784da05b0859 SHA-256: 3958611de42747b42bb14bf6bad25611fefb357a232a20d0f81eab3b532394c8
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=castle+car+wash+long+beach PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368969/normal_5faabcc903d62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456999/normal_5fb9cc499d034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5f9dd44be3d38.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/numubemezenoni_lexujifere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5fa0685e849a8.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/724ca951-89d5-4e39-b723-aa0fac96cb7a/mezowinixagivikujepar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e3e9c03-9e9e-40b9-b900-7483087e7902/gelosevewemulun.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/jejigabawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d1b2c0-0d37-4fbf-899e-76666bbb046b/97533221833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ec5a93a-be49-4e26-b497-658e832d9556/mei_leaf_brewing_guide.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_off0000c989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC989 5200 bytes
SHA-256: dd2eb4f46b99268c5999e36e2ab8616cd9cf5faa8949396689b7a4a1366453d9
font_01_sfnt_off0000db41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 10080 bytes
SHA-256: a3062a89a51815964361c90af71f81ec8cccec4eabd8118131addc1086affcbe