Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1c54d5db94bc3b…

MALICIOUS

PDF

74.8 KB Created: 2021-06-05 23:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d6e39b077a5e4685d60ceb9c719dc20e SHA-1: 5d32ff1a89022aa28c1b2f37e23fd8e7e8073e4d SHA-256: 3f1c54d5db94bc3bc6280ad53e208bf3b23e83094fa007b308ce36b938ba92c2
186 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 0.9960

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
  • 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.
  • 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://soxebez.ru/123?utm_term=comic+template+squarespace PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378390/normal_5fe8ae536d6d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388274/normal_5fd04fb899041.pdfIn PDF document text
    • https://fafuluzugow.weebly.com/uploads/1/3/1/4/131453648/monujifadet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_606e19603b949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485818/normal_5fd0e63ee91ba.pdfIn PDF document text
    • https://rigokapine.weebly.com/uploads/1/3/4/5/134593974/xezezidudo-rusut.pdfIn PDF document text
    • https://gofezirorelude.weebly.com/uploads/1/3/4/4/134486205/givafasibiv_tanipananen_sumowog_lisata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407304/normal_602f5d2287ba9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366341/normal_5fc8446137e81.pdfIn PDF document text
    • https://paseselok.weebly.com/uploads/1/3/1/8/131858791/narevupogomugo_begodutaruromer_gagatelo_kividemiga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410965/normal_603fb77a389ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486033/normal_603b2275cd57a.pdfIn PDF document text
    • https://wawokosekipazas.weebly.com/uploads/1/3/1/4/131452886/3633617.pdfIn PDF document text
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/3441127.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486984/normal_6006cd573158d.pdfIn PDF document text
    • https://pazowega.weebly.com/uploads/1/3/2/3/132303248/disufulabone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387706/normal_60654540f0737.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446643/normal_603181a992efb.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4463266/normal_60b64c538b892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443812/normal_60571fa59380e.pdfIn PDF document text
    • https://nutumavu.weebly.com/uploads/1/3/5/4/135400781/winujararelafanu.pdfIn PDF document text
    • https://zokeperivixif.weebly.com/uploads/1/3/4/3/134307771/4963ed335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473049/normal_600a43390f164.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/07b5cf21-6d3d-475a-acb9-2431a277dc60/where_to_donate_clothes_west_seattle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8e1e86a-e7b7-400d-9c10-263cbd680c49/sigotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c6bd96-5205-4a7d-b25c-d86f2f9973eb/radio_shack_pro_404_handheld_scanner_manual.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_off0000e683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE683 5108 bytes
SHA-256: 9908461efaa000c84fdf1225320a585ee9c47a2344fab1be7045878a02165afe
font_01_sfnt_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 10536 bytes
SHA-256: c8780a6b5f5b51e0807c429d5d33ba71e474dccbf61b5beb5d1c9f28f4fdf342