Malicious PDF — malware analysis report

Static analysis result for SHA-256 30751e47c0a39444…

MALICIOUS

PDF

79.1 KB Created: 2021-05-29 00:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: da58cf3600a25cfc8ff40976b99708cf SHA-1: 4ab8e12680b3ad5fd7435b5f0f9f3a6c9b00646e SHA-256: 30751e47c0a39444c62fa04a36d2b1be6cb391da7475901f1a179d8d57adf302
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=how+to+use+a+cobra+radar+detector PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418013/normal_5fefd249932c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402519/normal_60689e5109e73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491934/normal_5fcad4b168d29.pdfIn PDF document text
    • https://tebudewuve.weebly.com/uploads/1/3/2/6/132683230/151641ec9cea10a.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/8159104.pdfIn PDF document text
    • https://robiwadanojiso.weebly.com/uploads/1/3/4/6/134644007/4aa71592bc45.pdfIn PDF document text
    • https://daxakowov.weebly.com/uploads/1/3/4/7/134704390/9970673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487622/normal_60693e08b2093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490542/normal_600a5cffaa944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473064/normal_6012089b291ab.pdfIn PDF document text
    • https://tagorawijetix.weebly.com/uploads/1/3/5/3/135392874/mugune.pdfIn PDF document text
    • https://wagelefukat.weebly.com/uploads/1/3/4/2/134265927/baxawulipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414353/normal_6045d707d41f8.pdfIn PDF document text
    • https://dijitisabotiji.weebly.com/uploads/1/3/5/3/135324222/nipomatemulufiwuvi.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/dabojas-pipokuzamap-gerabaxolanak-tamajisez.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/05d9e33f-f888-4288-bb24-0fe9aa2bdfee/vaziwobofuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fc7fcbb-081b-428a-89f8-d7370883da89/83496256371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea2bd2a-dd3c-4d3e-b640-354939bcc6ef/jatesixenoxer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52ed1907-3fd8-4d7d-8192-26f244aa67ff/pl_sql_nvl_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8006861-67bd-4b04-b0f4-734df06fb68a/stock_investing_for_dummies_5th_edition_review.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_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 5092 bytes
SHA-256: 3cbf1e2bad2fa12d5eded580b56d622103014e89d2204b20edec4062cbc663f2
font_01_sfnt_off00010a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 10312 bytes
SHA-256: 2f53ad60f49508af1e0a7b0e0aeba21cddf5812795ae0411320df786c7ef98bb