Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd9ad45581adeaf…

MALICIOUS

PDF

78.6 KB Created: 2021-04-25 10:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4e899bdde9d93b8a44c8db4116e4a5e7 SHA-1: a8db1c1263223015136af5da9b8026bf06e7e167 SHA-256: 5bd9ad45581adeafc34aa49f100bbf5eaf2c6ab07297e4486b6983958647af69
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, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/strik?utm_term=love+letter+appreciating+her PDF link annotation
    • https://mesakarune.weebly.com/uploads/1/3/1/3/131380767/xetivulaten.pdfIn PDF document text
    • http://xitebimidejikuw.22web.org/13389975883.pdfIn PDF document text
    • https://nenusobodi.weebly.com/uploads/1/3/1/4/131406558/f30dcf49d5.pdfIn PDF document text
    • https://wusukinepazewa.weebly.com/uploads/1/3/4/3/134372908/pejenomet-zenamiwigi-gekezalem-simesenedubosu.pdfIn PDF document text
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/gezazuraderiv_bofuguviwep_kipifavalila_fobetob.pdfIn PDF document text
    • https://nesupopokajore.weebly.com/uploads/1/3/5/3/135394324/d485934600222.pdfIn PDF document text
    • https://bodumiwi.weebly.com/uploads/1/3/1/4/131406735/bfbb9e46f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406216/normal_5fee8fb4f3ae3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428033/normal_606398ecbf62c.pdfIn PDF document text
    • http://paximosikelos.22web.org/48376058192.pdfIn PDF document text
    • https://lifitexuga.weebly.com/uploads/1/3/4/3/134356919/97c95eb820dcb3.pdfIn PDF document text
    • https://pegalidaxib.weebly.com/uploads/1/3/4/6/134632492/bfc839e.pdfIn PDF document text
    • https://xutezanepone.weebly.com/uploads/1/3/3/9/133999331/5281188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466151/normal_605576feba9f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jikolelekad.epizy.com/arabisch_schreiben_lernen_bungen.pdfIn PDF document text
    • http://rugokabiko.epizy.com/lukozobowewixime.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/lekuvobunumanavisilanir.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/42841165433.pdfIn PDF document text
    • http://sulalanetoki.epizy.com/14388630157.pdfIn PDF document text
    • http://pexevogawi.epizy.com/project_schedule_management_plan_template.pdfIn PDF document text
    • http://bexamunexena.rf.gd/25623591260.pdfIn PDF document text
    • http://dewifazegukom.epizy.com/yahoo_mail_not_showing_images_on_android.pdfIn PDF document text
    • http://lagamifex.epizy.com/24111923362.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_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 5020 bytes
SHA-256: 30e41fe1beebe9793db9c89b9574d06ed6210174b3e7f432b3c162394a8203d9
font_01_sfnt_off000106f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F7 11224 bytes
SHA-256: 2deaeb25584214d0799d69d5fad9dd5a9db51a0757a3e1035cabcd995a7562ff