Malicious PDF — malware analysis report

Static analysis result for SHA-256 252d5a607cc9c98f…

MALICIOUS

PDF

74.1 KB Created: 2021-05-28 00:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 303c0a70ea50e0f5ee0d22b7fddd311f SHA-1: 9e87c45794cff93f996b0ebccbc4963e0198784d SHA-256: 252d5a607cc9c98f4a5f470a24516358d9104bcd56a435d4d48c959e33064681
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 0.9989

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://jottigo.ru/strik?utm_term=what+is+the+meaning+of+tens+and+units PDF link annotation
    • https://gapulujazupimes.weebly.com/uploads/1/3/4/7/134775062/buliji_xovara.pdfIn PDF document text
    • https://zarujiwimil.weebly.com/uploads/1/3/4/9/134900424/6005736.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380210/normal_602a751351a62.pdfIn PDF document text
    • https://lefokanu.weebly.com/uploads/1/3/4/3/134377273/rukid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444885/normal_5fcc90c211344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461770/normal_60552e3ec0775.pdfIn PDF document text
    • https://kivexobine.weebly.com/uploads/1/3/4/8/134859900/zanejovegobetoxi.pdfIn PDF document text
    • https://fokuxadeji.weebly.com/uploads/1/3/4/5/134585395/4223971.pdfIn PDF document text
    • https://kosigejobawazi.weebly.com/uploads/1/3/4/3/134315380/ravonuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452385/normal_6014e0d8a9dec.pdfIn PDF document text
    • https://xagajanum.weebly.com/uploads/1/3/4/5/134599721/8f9e8e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450145/normal_604683f27e9f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_602a00ca76db6.pdfIn PDF document text
    • https://wonaxegem.weebly.com/uploads/1/3/6/0/136049801/0aeb59d08471.pdfIn PDF document text
    • https://lorazitir.weebly.com/uploads/1/3/4/3/134393639/e7dc18.pdfIn PDF document text
    • https://veponigizut.weebly.com/uploads/1/3/0/9/130969631/bepusosozurovi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375356/normal_5ff47aa8849ae.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/372e7ad8-8b47-4e5f-899e-0786f47e1212/keto_diets_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c2f39a5-2c5e-4eab-8807-aff94564f314/rajokupew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b935147-c941-4bfb-b090-6abf2aca192c/5181938674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2070d2a-76ed-4cbe-b719-9b206df8a40b/crowfeathers_trial_read_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d90cc6b-a4a8-4d2d-bed1-2f000e5c8eda/walther_ppk_7.65_serial_number_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ac63562-4da6-42fb-94b7-0b560fdf36aa/nunetup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b53a02-d5af-4d79-8c15-410663389522/how_to_start_haier_ac_without_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/298c43a6-3550-4d02-997d-948f1e36394d/nerewozimurexosi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60D 5204 bytes
SHA-256: 584a44c2dd07db95677a25010a1a33abfa06d711e72f85c20448658808771e22
font_01_sfnt_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 3208 bytes
SHA-256: 4cee27820f85c7bfed9bdbcf7747bafcb4ebf27d5082d349ef6fdfbef127ea31
font_02_sfnt_off0000f4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 10404 bytes
SHA-256: d17206989c3097c60fbb5b2ef22f3586db138d1519876ad9c90da814a0f113df