Malicious PDF — malware analysis report

Static analysis result for SHA-256 073a3633df391283…

MALICIOUS

PDF

115.4 KB Created: 2020-11-24 21:54:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 30be60fe2bcbc5d4b9759aa2f7faf946 SHA-1: 2da357b46ada40fc0bc292c337b9d83c53e6a197 SHA-256: 073a3633df3912831ce484334676e3d8aabbc2e7dec70e7088ff94597092d56a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded external links, identified as a PDF SEO link farm. The primary URL, 'https://trafftec.ru/123?utm_term=pilon+sandra+cisneros+summary', suggests a potential phishing or spamming campaign. While no scripts were explicitly extracted, the heuristic firings and the nature of the embedded links strongly indicate malicious intent, likely related to directing users to malicious content or phishing sites.

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://trafftec.ru/123?utm_term=pilon+sandra+cisneros+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405687/normal_5fa6e17c66dd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5f8c8bdd5fe62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_5faf13d67a4e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369777/normal_5f886c46a5db4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402936/normal_5f99e3629b0b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_5f9d89b44a63a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_5f89b0e45fd15.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/603817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500677/normal_5fb378ae6b807.pdfIn PDF document text
    • https://mupexopuwes.weebly.com/uploads/1/3/4/7/134722910/pizoxak-fatedi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_5f8e8782b85db.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://s3.amazonaws.com/fasanag/82050011050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/319973b8-4e41-4913-8c10-a2d6cb6c5860/ruwudevisilumodufanikid.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/68451046481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c86fd2a-7457-46d9-b943-a491298dd237/santo_rosario_domingo_nazaret.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b55d277e-624e-4164-8f83-08ee7369778c/49021097327.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_off00017c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C25 4992 bytes
SHA-256: 7dcab4361a6b6dbc2c5d59bcbaf5b249c26cc2627460c525c856a1e48093d240
font_01_sfnt_off00018ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CEB 11196 bytes
SHA-256: 6f3bc0543cdb8b79922f24269234561ec92198de3a34ad69619b1798841df9a2
font_02_sfnt_off0001b228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B228 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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