Malicious PDF — malware analysis report

Static analysis result for SHA-256 615d8660e6eb7e42…

MALICIOUS

PDF

81.2 KB Created: 2021-04-04 14:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d559aba0a14f1fa7fdeb860e1f0a872a SHA-1: cafc644caa61f6ce84c6cbb6896227ade650c824 SHA-256: 615d8660e6eb7e42677b05b9ed717127e4c4443d9944917f323de86b9de2c48b
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 0.9997

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://golowaki.ru/award?keyword=rajasthan+budget+2020+20+pdf PDF link annotation
    • https://tetemubegogik.weebly.com/uploads/1/3/4/4/134443084/vuwadutal.pdfIn PDF document text
    • https://cdn.sqhk.co/gibebomesani/cjdojds/stokke_tripp_trapp_harness_removal.pdfIn PDF document text
    • https://rekaxarekarefov.weebly.com/uploads/1/3/5/3/135300852/wiperilenufabu.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/hd8vIgc/samurai_sword_set.pdfIn PDF document text
    • https://zexivavu.weebly.com/uploads/1/3/4/8/134872555/4444069.pdfIn PDF document text
    • https://wopadutizibum.weebly.com/uploads/1/3/4/3/134306931/jilimeg.pdfIn PDF document text
    • https://jufasoxoko.weebly.com/uploads/1/3/5/3/135315704/nozukirajoxit_pasegokowiwova.pdfIn PDF document text
    • https://gebapawuvafiv.weebly.com/uploads/1/3/4/5/134519736/mejibewexoxogep-betexaf-xekisudubuman-neliw.pdfIn PDF document text
    • https://pesukiziguz.weebly.com/uploads/1/3/4/1/134108741/puxofivukil.pdfIn PDF document text
    • https://rivixajonezil.weebly.com/uploads/1/3/1/4/131437445/4966402.pdfIn PDF document text
    • https://vedisowokiwovos.weebly.com/uploads/1/3/4/7/134767265/zifirukij.pdfIn PDF document text
    • https://dazuzidasepod.weebly.com/uploads/1/3/2/6/132681566/c0c6ab.pdfIn PDF document text
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/1009805.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_34b07bf749974d8e96a77fcb910a346e.pdf?index=trueIn PDF document text
    • https://e148473a-3d1a-46f8-b788-fbc1f5af68d4.filesusr.com/ugd/e1e70b_224f8819f78c4471a32ae0ad7366d11d.pdf?index=trueIn PDF document text
    • https://b0837e58-6fb0-4b2c-a83d-c451c4d85cc2.filesusr.com/ugd/1169b1_49e8819cadbc4eea8ca62c69d3fea7f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fizaxo/90363649116.pdfIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_21ce35b25c4b463784ffbd22d96f4f7d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/dreamweaver_website_templates.pdfIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_112fb3892885434c9c685d62e7f98296.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/29467175435.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_off0000fc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8E 5672 bytes
SHA-256: 34de60d7011613b787ab4db924f7554f272e83b57f96589edd99708ad47fc193
font_01_sfnt_off00010fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE5 11244 bytes
SHA-256: c4715d57957b84854293c76cac258c8a23822e5b566c2115f9c9e1929ccf46a1