Malicious PDF — malware analysis report

Static analysis result for SHA-256 be77e70ec4868694…

MALICIOUS

PDF

82.2 KB Created: 2021-02-12 11:12:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: eb0d28dfc2e1269e7e81cd3ddace9c32 SHA-1: a87f635a12019e803e8d4c7a7219e8dc7295129f SHA-256: be77e70ec48686942771a12f2291f68d38eaa80aaa88f26a60187520a73cf212
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, including suspicious domains like 'leonvi.ru' and 'idealsit.space'. The PDF structure and the presence of external URIs suggest it's designed to lure users to potentially malicious content or phishing sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/wix?keyword=ilmater+favored+weapon PDF link annotation
    • http://idealsit.space/senigomubopagokjg5r9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444626/normal_60252fa1050eb.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/4130508.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479688/normal_5ff341cf00e90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480182/normal_5ffd5a4e77556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478430/normal_5fd7c37a62c42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417805/normal_5fee8b4bd37db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480423/normal_6024be3fe4a1f.pdfIn PDF document text
    • http://karnaval.host/03_greedo_purple_summer_03_downloadidcc0.pdfIn PDF document text
    • https://bolumuratojepo.weebly.com/uploads/1/3/4/7/134749128/xibikug-luwatej-gageroru.pdfIn PDF document text
    • https://wiwetone.weebly.com/uploads/1/3/4/6/134660192/jutakitukijuweburu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pavasokunise.epizy.com/kumon_math_worksheets_grade_3.pdfIn PDF document text
    • http://suvoxezol.rf.gd/brickleberry_o2tvseries._co._za.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/aydin_university_application_form.pdfIn PDF document text
    • http://kagapari.rf.gd/anecdotes_in_american_english_free.pdfIn PDF document text
    • http://detuzojezil.rf.gd/anathema_full_album_free.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_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 5096 bytes
SHA-256: 0512ddf799945b385c1bcf0afbb6ac27828aa098fc84ac9e79c0037998eb3065
font_01_sfnt_off00011808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11808 10360 bytes
SHA-256: 85131b1c0cf6b92a52d4acb78596a43cf25e5d3e7e2d1336da086efc9f27b660

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