Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2020c9dacd41ccf…

MALICIOUS

PDF

76.1 KB Created: 2021-03-05 13:21:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3ba85e2441cbe94fe7429343086cd6be SHA-1: 2ed8d31feb6fb409e1485c4a33b04b192fd07529 SHA-256: a2020c9dacd41ccf9bf909500d854491a960eb5db203ce44292a0ed992cea9bc
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs extracted is https://resalured.ru/wix?keyword=mares+of+diomedes+bandcamp, which is likely part of the lure. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/wix?keyword=mares+of+diomedes+bandcamp PDF link annotation
    • https://jebunofom.weebly.com/uploads/1/3/4/4/134468214/tovurazorugug.pdfIn PDF document text
    • https://nifonafepo.weebly.com/uploads/1/3/5/3/135319448/9710471.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458132/normal_6008d911988cc.pdfIn PDF document text
    • https://zomasaxejis.weebly.com/uploads/1/3/4/3/134325580/zedezomovu.pdfIn PDF document text
    • http://witogitozukifon.iblogger.org/milton_friedman_capitalismo_e_liberdade.pdfIn PDF document text
    • https://nutovavodus.weebly.com/uploads/1/3/4/0/134012609/b6392582464.pdfIn PDF document text
    • https://zavurebugefogoj.weebly.com/uploads/1/3/4/3/134397626/0d2eea0337875c.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/timex_1440_sports_watch_manual.pdfIn PDF document text
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/kivitaruruveku-dubozeboxo-dalidomoxolo.pdfIn PDF document text
    • https://pimazapodozem.weebly.com/uploads/1/3/2/8/132814260/zarabemesa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_60374602577bb.pdfIn PDF document text
    • https://giwulotasika.weebly.com/uploads/1/3/1/4/131411199/resawagosovesak_tanaridure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sitafefisoju.atwebpages.com/nikon_n80_manual.pdfIn PDF document text
    • http://zavinawotomuvef.epizy.com/39591572256.pdfIn PDF document text
    • http://waxuxeg.rf.gd/broken_vessels_hillsong_mp4.pdfIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/illich_deschooling_society.pdfIn PDF document text
    • http://nufewusuk.rf.gd/first_law_of_thermodynamics_application.pdfIn PDF document text
    • http://buzapodux.rf.gd/tukojisejuvaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b8ab7ba-6c5e-4f42-84fb-ef294b7651b7/11269108945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/babd1ef5-52bf-4f3d-8570-79feab6e1578/how_to_use_a_kenmore_top_load_washer.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_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 5412 bytes
SHA-256: 7fc49de9cc202946a4805bdb6a911a4dbe3f9f359c08da47782a3390f6a5ca02
font_01_sfnt_off0000fe9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9B 11104 bytes
SHA-256: 977fe47a113f404e9a46136bfc306e7d2ba56b265028db602991568cf12cf9e5