Malicious PDF — malware analysis report

Static analysis result for SHA-256 339834ff33b6358d…

MALICIOUS

PDF

99.7 KB Created: 2021-01-07 15:14:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0e666e946ce5ba54498a69c9490c3fd7 SHA-1: b9c5297e2f8ab5c1338711da830272f53c9425f5 SHA-256: 339834ff33b6358dc152885194740762de4476be6cfc148b8751fdac720c9f6b
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and a known malicious redirector. The primary purpose appears to be directing users to external, potentially harmful content, rather than providing legitimate information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=torrey+pines+high+school+golf+roster In PDF document text
    • https://static.s123-cdn-static.com/uploads/4499309/normal_5ff2bd0e34a8d.pdfIn PDF document text
    • https://fajizaxaro.weebly.com/uploads/1/3/1/3/131381717/5954fa.pdfIn PDF document text
    • https://fojomuku.weebly.com/uploads/1/3/4/4/134447263/8a1ba956319789c.pdfIn PDF document text
    • https://zibefaxad.weebly.com/uploads/1/3/4/5/134594794/firasus.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/igjhahh/mobile_kitchen_for_sale_in_cape_town.pdfIn PDF document text
    • https://fezulenigi.weebly.com/uploads/1/3/4/4/134485980/f07cd.pdfIn PDF document text
    • https://tijikazi.weebly.com/uploads/1/3/4/3/134373218/e5e3c6b50.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/98b32570-da88-4b93-bd1f-5c6e608eb79d/kawazavidoribapat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4548d00f-9cdb-4a44-bde3-cd353e2a260c/82199979325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0076cb0e-f075-4218-a462-222332c4362a/zudutifolufurilopop.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 7024 bytes
SHA-256: afe7beb8fb9567e5b22662a26a4b92ad1d737ec69daeafa4420432b773c62a99
font_01_sfnt_off00011f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 5116 bytes
SHA-256: b78ddf117c24744f021e35b622b1839c0e9c1167a3fb456796c48608df636eb6
font_02_sfnt_off000130e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E8 5212 bytes
SHA-256: c180db39926adb5144878375a5411d301933f435329f0442cb6b55e90ae434e0
font_03_sfnt_off00013fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA1 12488 bytes
SHA-256: 545684d3f3b10b4864e0dbb5145ae6add674ce93e83b84fe3a49527ce1c6fb45
font_04_sfnt_off000169a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169A0 16756 bytes
SHA-256: d8041882b80bae9b4882dedec3c86eea4544ad54d8b9ecb807a055d506e10ffd

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