Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b1eb309359d252…

MALICIOUS

PDF

61.7 KB Created: 2020-12-28 09:08:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fc10a5fe2ae60eefe9fcbcc77146f25 SHA-1: 53c6fe3e31b58320795408d7b57b1a4e5ee262c4 SHA-256: f1b1eb309359d252dc70780caeb971bb1fa294c794d685c21913434acfaaff3d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=baytown+seafood+menu+texas+city
    • https://static.s123-cdn-static.com/uploads/4483070/normal_5fdf6a3228f4f.pdf
    • https://cdn-cms.f-static.net/uploads/4499673/normal_5fdbd014ccedd.pdf
    • https://cdn-cms.f-static.net/uploads/4489428/normal_5fad6cc977f7f.pdf
    • https://taguraridefukal.weebly.com/uploads/1/3/4/4/134446716/jinaxexudop.pdf
    • https://dakokegeter.weebly.com/uploads/1/3/4/7/134723120/bb503b84c.pdf
    • https://bonifivudinuf.weebly.com/uploads/1/3/4/3/134305406/jenasetepesaz.pdf
    • https://sililojakofatef.weebly.com/uploads/1/3/2/7/132712383/2830c996aba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/purawuma/lorijolupa.pdf
    • https://uploads.strikinglycdn.com/files/199a56ff-e38a-4092-8668-e25b67008e6e/87404546305.pdf
    • https://s3.amazonaws.com/gebukil/asuran_full_bgm_masstamilan.pdf
    • https://s3.amazonaws.com/loxopudizus/72411057140.pdf
    • https://s3.amazonaws.com/legesiliv/cambridge_ielts_9_listening_test_2_answers.pdf
    • https://uploads.strikinglycdn.com/files/6cd42333-c3ed-4d2d-a817-f81b033e5bc7/the_legend_of_maula_jatt_trailer.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3b5.bin
0b682d6c918a4dcdb45b037733574f5e496d3844c57ff843ba92a6141f0e6238
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B5 5348 bytes
font_01_sfnt_off0000c5fd.bin
cdd2ba03d2a48555c3b7bcfae61a3bb372c5dee4523085a590a946e2cb2756a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FD 10492 bytes