Malicious PDF — malware analysis report

Static analysis result for SHA-256 25853604d97e3e76…

MALICIOUS

PDF

79.9 KB Created: 2021-05-24 00:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 33a587cc5b10819a46d6741d516cf30a SHA-1: 14b33362398be834520e433c70dc2a5939686207 SHA-256: 25853604d97e3e76db708c00a149cc1197a0c652acc8ec28ee3d78a99697b418
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 0.9993

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://vilenefex.ru/strik?utm_term=notas+de+flauta+dulce+cancion+despacito PDF link annotation
    • https://pikemane.weebly.com/uploads/1/3/4/7/134775920/voxumulav.pdfIn PDF document text
    • https://lonofajizol.weebly.com/uploads/1/3/5/3/135389348/belikiw-misokoduwojig-karodobir-neludeweze.pdfIn PDF document text
    • https://xofuvavafifibib.weebly.com/uploads/1/3/4/3/134386759/2268923.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/zeragizuzageb.pdfIn PDF document text
    • https://gitonuzulikune.weebly.com/uploads/1/3/4/8/134885185/xamexiti.pdfIn PDF document text
    • https://lajisoxe.weebly.com/uploads/1/3/4/4/134435468/321b8fc03.pdfIn PDF document text
    • https://lajibomigijiku.weebly.com/uploads/1/3/4/5/134587714/8925890.pdfIn PDF document text
    • https://mawenevemubazu.weebly.com/uploads/1/3/4/4/134402841/rabimi-kesusemuge.pdfIn PDF document text
    • https://wumaluruporemad.weebly.com/uploads/1/3/0/9/130969386/ea084aa.pdfIn PDF document text
    • https://tutemedoz.weebly.com/uploads/1/3/2/8/132814241/96cc9ad4a63da.pdfIn PDF document text
    • https://milalidit.weebly.com/uploads/1/3/1/4/131437162/2522203.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/potimopadud.pdfIn PDF document text
    • https://zepazilarewar.weebly.com/uploads/1/3/4/3/134310653/daponabobom.pdfIn PDF document text
    • https://tilawifi.weebly.com/uploads/1/3/4/4/134480999/2428894.pdfIn PDF document text
    • https://nibowivuxewanu.weebly.com/uploads/1/3/1/3/131379040/sevowa.pdfIn PDF document text
    • https://kapojisu.weebly.com/uploads/1/3/2/6/132696117/soxefiti_fowivun_wamebavorazi.pdfIn PDF document text
    • https://napufifibadabe.weebly.com/uploads/1/3/1/4/131406817/paxido.pdfIn PDF document text
    • https://vakigosem.weebly.com/uploads/1/3/4/4/134480352/6962606.pdfIn PDF document text
    • https://raxuzorozejataw.weebly.com/uploads/1/3/4/0/134042373/c2fe5.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/29e0bdbf-b50a-4081-99a5-3b26dd84647b/apple_airport_express_a1392_airplay_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e14d5c-0ed0-4cf6-b532-c852423ff108/42889062964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7d73bc2-52ed-4000-9736-cec28b39f103/wujulapoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5826c943-79fb-4984-8f65-87c7ffb7332e/atwood_water_heater_gc10a-4e_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd166737-d30a-48c5-a4a5-eb389cd17197/wiwebaganikos.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_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 5020 bytes
SHA-256: 2241143c143469343d618e19f6ad7f8825ddf51939ba28d8326e977ec1e96819
font_01_sfnt_off00010953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10953 12056 bytes
SHA-256: c8423d9e675c12e83cb0e05d8246c60a58e78dd822f0466268e0ed1e18369bb6