Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b04ef424110434…

MALICIOUS

PDF

80.4 KB Created: 2021-05-30 16:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ed4d6abe2359fc5e48f31eed5b59dbe8 SHA-1: 154323592018b9d14d0e6316986e91187c6f1ec9 SHA-256: 10b04ef424110434b845accb2c36ed25366c54811f20d3f92024291f9ea8c5bb
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cdn-cms.f-static.net/uploads/4487658/normal_60654fada2785.pdf In PDF document text
    • https://lokurosafo.weebly.com/uploads/1/3/4/4/134479987/xumunojarojubosurut.pdfIn PDF document text
    • https://duxotitur.weebly.com/uploads/1/3/4/5/134596147/miwaxavuzuzevas.pdfIn PDF document text
    • https://suvojenedixu.weebly.com/uploads/1/3/4/3/134354738/mowuzizitozijufena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490722/normal_601b3111d963d.pdfIn PDF document text
    • https://pazaduzot.weebly.com/uploads/1/3/4/4/134473777/ritozudub-virazezopis-gazalujozus-sitebabekidu.pdfIn PDF document text
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/zofopozosaganolopota.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417995/normal_5fca4964aff0e.pdfIn PDF document text
    • https://fokididekorup.weebly.com/uploads/1/3/0/7/130775810/dopepolome-pivesugezitof-ruvimixupemuj.pdfIn PDF document text
    • https://tuzupenaxu.weebly.com/uploads/1/3/1/4/131454165/42d9ee1ea576d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_6058ad2e351aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388596/normal_6022a6aeb3426.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414860/normal_5fdd3ce7c799c.pdfIn PDF document text
    • https://dekodisiga.weebly.com/uploads/1/3/6/0/136051758/gufipuwilepiv.pdfIn PDF document text
    • https://tavigawatogup.weebly.com/uploads/1/3/5/3/135389884/bilijidu.pdfIn PDF document text
    • https://towoxaji.weebly.com/uploads/1/3/0/7/130740158/jixevajug-saxusok-pozojebigutabaf.pdfIn PDF document text
    • https://nesexabaxurozij.weebly.com/uploads/1/3/4/8/134898102/fotukaparel_faninifiwutovo_rujemefom_vulopujadeko.pdfIn PDF document text
    • https://lozatovetifeg.weebly.com/uploads/1/3/3/9/133999134/2336810.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/mO-5lVq97NI/wb?keyword=can%20i%20get%20adobe%20acrobat%20pro%20for%20freePDF link annotation
    • https://uploads.strikinglycdn.com/files/cc876f23-9667-45e2-aa89-f1a20d1a17c5/netgear_wnr1000v2_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e50fd1d-2f42-4292-8202-52e85172605f/jebifajokuwut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd2c095-d456-4b82-bcf4-81170315c665/tyt_matematik_rasyonel_saylar_km_sorular.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c51f32-ea95-4527-9750-684cda5ea060/mr_president_gameplay.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_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 5156 bytes
SHA-256: 09068ccb6b62dcd9b69c98300579e69de8069334df33320cd23c06f52bff6e82
font_01_sfnt_off00010be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE7 11652 bytes
SHA-256: 59aff84ada550554cc4a8f0f5debf3b4f4a403ae9ce62da3baa3489031668e61