Malicious PDF — malware analysis report

Static analysis result for SHA-256 39340e5cbdea1530…

MALICIOUS

PDF

86.0 KB Created: 2020-11-13 06:17:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f76f29994aa8ae4bdcaffe8ddc73332 SHA-1: 64901002d4f8debd0a75cba2e63b267c4c702507 SHA-256: 39340e5cbdea1530d13cb95e85c3a52aacccbc2c95f7c2076adbadfff04fb2e5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. ClamAV detection and ML classification further indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious redirection or content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?utm_term=bhakta+tukaram+3gp+video+songs
    • https://cdn-cms.f-static.net/uploads/4463306/normal_5fa58444a3cc7.pdf
    • https://cdn-cms.f-static.net/uploads/4387925/normal_5fa01b033c4eb.pdf
    • https://bitebizato.weebly.com/uploads/1/3/4/5/134583528/nubuni.pdf
    • https://cdn-cms.f-static.net/uploads/4388052/normal_5f978cdfb46ea.pdf
    • https://cdn-cms.f-static.net/uploads/4450864/normal_5fa5d74803d72.pdf
    • https://lifotuvuzaraxur.weebly.com/uploads/1/3/0/7/130775275/womubog.pdf
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/musenene_xaberel_morupobi_tumegefif.pdf
    • https://vebifejelib.weebly.com/uploads/1/3/0/7/130775119/9796567.pdf
    • https://genamimiwovem.weebly.com/uploads/1/3/1/6/131636881/jodipibazipojodudo.pdf
    • https://cdn-cms.f-static.net/uploads/4418556/normal_5faaff9d1a429.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fejenijovekozu/kosanunulu.pdf
    • https://uploads.strikinglycdn.com/files/e0e0710a-adc3-4b01-a854-4ee30efa909d/jileberibetin.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010248.bin
70432f16a2d4a76146277765f53696826123cbd118f129006e774ccc8dd96bc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 5560 bytes
font_01_sfnt_off00011512.bin
b2621800900e547be0f6ea7dc095323dea27939a495859ca9f586125ff51d41e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11512 11476 bytes
font_02_sfnt_off00013b8d.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8D 4324 bytes