Malicious PDF — malware analysis report

Static analysis result for SHA-256 8186b272edc6a343…

MALICIOUS

PDF

62.3 KB Created: 2021-01-07 04:19:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4dd12170367bd6cb0fd3ec1c5ab92e1e SHA-1: 528540e5460081d1ce07d5ac9ae71189bdfd54fd SHA-256: 8186b272edc6a3434d175fe11f88e1504ffc2e6a058a5bd288c47897ea3fe68e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document exhibits characteristics of a link farm or phishing lure, indicated by the high number of external links and the use of disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs points towards redirection to malicious sites.

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://trafftec.ru/wb?keyword=wings%20etc%20menu%20boiling%20springs%20sc PDF link annotation
    • https://cdn.sqhk.co/goluxewimabu/TLrLfkp/energy_anti_stress_loops_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502464/normal_5fb91dd726e22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374710/normal_5fc6692463083.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/8276696.pdfIn PDF document text
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/riwamiseki.pdfIn PDF document text
    • https://rinedasufuketon.weebly.com/uploads/1/3/4/3/134340565/45c0a2c.pdfIn PDF document text
    • https://walutosewog.weebly.com/uploads/1/3/4/3/134312240/gesasadivisipowivaf.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/7854898.pdfIn PDF document text
    • https://cdn.sqhk.co/retepisej/ragfZhh/24784696957.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/drop_down_list_in_excel_different_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc31c65-172f-4286-8bfc-95a5a5327aa6/download_a_free_resume.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/45651722628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e582838-c85f-41d5-9ef6-94ff0e60af57/pokifumutozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaac73df-2c59-4984-85fd-8c9fd39aba22/blink_of_an_eye_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/976a9f86-dca2-4532-9324-48a15bebafd4/tokilikejileb.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_off0000b794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB794 5196 bytes
SHA-256: 812781a840801bbe85b75105b0ae5e29c1186de16d036889ba045f19d5f6a027
font_01_sfnt_off0000c93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93F 10324 bytes
SHA-256: f9081f0cdb44822d65e4d6e559b18580686b0504432bf50b97b5587f7470734a

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